Method for Controlling Uplink Transmit Power in Inter-Base Station Carrier Aggregation, Base Station, and Device

ABSTRACT

A method for controlling an uplink transmit power in an inter-bas station carrier aggregation, a base station and a device are disclosed. In an embodiment the method includes providing for a first base station, by a second base station, a status of an uplink resource that is scheduled by the second base station for a user equipment (UE), wherein a maximum uplink transmit power that is allocated by the UE to the first base station is based on the status of the uplink resource and scheduling for the UE, by the second base station, the uplink resource according to the status of the uplink resource.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/921,941, filed on Oct. 23, 2015, which is a continuation ofInternational Application No. PCT/CN2013/074689, filed on Apr. 25, 2013.All of the aforementioned patent applications are hereby incorporated byreference in their entireties.

TECHNICAL FIELD

Embodiments relate to wireless communications technologies, and inparticular, to a method for controlling an uplink transmit power ininter-base station carrier aggregation, a base station, and a device.

BACKGROUND

With development of mobile communications technologies, the 3rdGeneration Partnership Project (3GPP for short) imposes higherrequirements on a peak data rate and a system bandwidth and the like. Tosatisfy the requirements, carrier aggregation (CA for short) isintroduced in a 3GPP Long Term Evolution Advanced (LTE-A for short)system. CA may acquire a higher bandwidth by aggregating multiplecontiguous or non-contiguous component carriers (CC for short), therebyincreasing the peak data rate and a system throughput. In a carrieraggregation system, when user equipment (UE for short) works on multiplecarriers, an eNB is allowed to schedule a part or all of the carriersfor the UE to perform uplink transmission simultaneously. In this case,for proper scheduling by the eNB, the UE needs to report its powerheadroom (PH for short).

CCs in CA may be provided by a same base station (called intra-basestation CA), or may also be provided by different base stations (calledinter-base station CA). In an existing LTE-A standard, for intra-basestation CA, after a power headroom report (PHR for short) is triggered,the UE sends the PHR in any serving cell, where the PHR includesinformation such as a power headroom reserved for each serving cell. Thebase station receives the PHR, and may estimate a downlink path loss ofthe UE in each serving cell and coordinate uplink resource allocation ofeach serving cell. For inter-base station CA, after a PHR is triggered,the PHR sent by the UE in any serving cell can be received by only oneof the base stations, and a base station receiving the PHR does not knowan allocation status of uplink resources of other base stations andcannot coordinate an uplink resource of each serving cell. Consequently,a problem of transmission resource waste and low transmission efficiencyis caused.

SUMMARY

Embodiments provide a method for controlling an uplink transmit power ininter-base station carrier aggregation, a base station, and a device, soas to avoid waste of uplink resources scheduled by a base station for UEand improve transmission efficiency.

A first aspect provides a method for controlling an uplink transmitpower in inter-base station carrier aggregation. The method includesacquiring, by a first base station, a maximum uplink transmit power thatis allocated by user equipment UE to the first base station, where themaximum uplink transmit power is determined according to a status of anuplink resource that is scheduled by a second base station for the UE;and configuring, by the first base station, an uplink transmit power forthe UE according to the maximum uplink transmit power.

In a first possible implementation manner of the first aspect, the firstbase station is a secondary base station, and the second base station isa master base station.

With reference to the first aspect and the first possible implementationmanner of the first aspect, in a second possible implementation mannerof the first aspect, the acquiring, by a first base station, a maximumuplink transmit power that is allocated by UE to the first base station,includes receiving, by the first base station, from the second basestation or the UE, the status of the uplink resource that is scheduledby the second base station for the UE; and determining, by the firstbase station, according to the status of the uplink resource that isscheduled by the second base station for the UE, the maximum uplinktransmit power that is allocated by the UE to the first base station.

With reference to the first aspect and the first possible implementationmanner of the first aspect, in a third possible implementation manner ofthe first aspect, the acquiring, by a first base station, a maximumuplink transmit power that is allocated by UE to the first base station,includes receiving, by the first base station, from the second basestation or the UE, the maximum uplink transmit power that is allocatedby the UE to the first base station, where the maximum uplink transmitpower is determined by the second base station or the UE according tothe status of the uplink resource that is scheduled by the second basestation for the UE.

With reference to the second or third possible implementation manner ofthe first aspect, in a fourth possible implementation manner of thefirst aspect, the status of the uplink resource is semi-persistentscheduling configuration information of the uplink resource that isscheduled for the UE when the second base station establishes a voiceservice for the UE.

In a fifth possible implementation manner of the first aspect, thesemi-persistent scheduling configuration information includes asemi-persistent scheduling configuration command, a semi-persistentscheduling SPS configuration deletion command, a semi-persistentscheduling SPS activation instruction, and a semi-persistent schedulingSPS deactivation instruction.

With reference to the second possible implementation manner of the firstaspect, in a sixth possible implementation manner of the first aspect,the determining, by the first base station, according to the status ofthe uplink resource that is scheduled by the second base station for theUE, the maximum uplink transmit power that is allocated by the UE to thefirst base station, includes determining, by the first base station, anoffset of an uplink transmit power according to the status of the uplinkresource that is scheduled by the second base station for the UE; andadding, by the first base station, the offset to an initial maximumuplink transmit power that is allocated by the UE to the first basestation, and determining that a sum of the offset and the initialmaximum uplink transmit power is the maximum uplink transmit powerallocated by the UE to the first base station.

In a seventh possible implementation manner of the first aspect, thedetermining, by the first base station, an offset of an uplink transmitpower according to the status of the uplink resource that is scheduledby the second base station for the UE, includes determining, by thefirst base station, the offset of the uplink transmit power whenidentifying, according to the status of the uplink resource that isscheduled by the second base station for the UE, that an uplink resourcescheduled by the second base station for the UE at a current time pointis lower than a set threshold.

In an eighth possible implementation manner of the first aspect, a valueof the offset is preconfigured.

With reference to the first aspect and the first and second possibleimplementation manners of the first aspect, in a ninth possibleimplementation manner of the first aspect, after the allocating, by thefirst base station, an uplink transmit power to the UE according to themaximum uplink transmit power, the method further includes, when theuplink transmit power determined by the first base station changescompared with a historical value, or when a variation exceeds a presetthreshold, acquiring a power headroom of the UE that is recalculatedaccording to the maximum uplink transmit power.

With reference to the first aspect and the first to ninth possibleimplementation manners of the first aspect, in a tenth possibleimplementation manner of the first aspect, the method further includesreceiving, by the first base station, preset power information sent bythe second base station, where the preset power information includes atleast an uplink transmit power that is preconfigured by the second basestation at a next time point for the UE; and determining, by the firstbase station, according to the preset power information, an uplinktransmit power that is configured by the first base station at the nexttime point for the UE.

In an eleventh possible implementation manner of the first aspect, thepreset power information includes a maximum transmit power of the UE, amaximum transmit power allocated by the UE to the second base station,an uplink control information scheduling status of the UE, a maximumtransmit power allocated by the UE to each carrier of the second basestation, and an offset of an uplink transmit power used by the secondbase station.

With reference to the first aspect and the first to eleventh possibleimplementation manners of the first aspect, in a twelfth possibleimplementation manner of the first aspect, the method further includesacquiring, by the first base station, the initial maximum uplinktransmit power that is allocated by the UE to the first base station,where the initial maximum uplink transmit power is determined accordingto a downlink path loss or an uplink path loss between each base stationand the UE; and allocating, by the first base station, the uplinktransmit power to the UE according to the initial maximum uplinktransmit power.

In a thirteenth possible implementation manner of the first aspect, theacquiring, by the first base station, the initial maximum uplinktransmit power that is allocated by the UE to the first base station,includes receiving, by the first base station, the initial maximumuplink transmit power that is allocated by the UE to the first basestation and reported by the UE, where the initial maximum uplinktransmit power is allocated by the UE from the maximum uplink transmitpower of the UE according to a proportion of the downlink path lossbetween each base station and the UE.

With reference to the twelfth possible implementation manner of thefirst aspect, in a fourteenth possible implementation manner of thefirst aspect, the acquiring, by the first base station, the initialmaximum uplink transmit power that is allocated by the UE to the firstbase station, includes receiving, by the first base station, the initialmaximum uplink transmit power that is allocated by the UE to the firstbase station and sent by the second base station, where the initialmaximum uplink transmit power is allocated by the second base stationfrom the maximum uplink transmit power of the UE according to aproportion of the downlink path loss between each base station and theUE.

With reference to the twelfth possible implementation manner of thefirst aspect, in a fifteenth possible implementation manner of the firstaspect, the acquiring, by the first base station, the initial maximumuplink transmit power that is allocated by the UE to the first basestation, includes receiving, by the first base station, the downlinkpath loss of each base station that is reported by the UE; andobtaining, by the first base station by calculation, from the maximumuplink transmit power of the UE and according to a proportion of eachdownlink path loss, the initial maximum uplink transmit power that isallocated by the UE to the first base station.

With reference to the twelfth possible implementation manner of thefirst aspect, in a sixteenth possible implementation manner of the firstaspect, the acquiring, by the first base station, the initial maximumuplink transmit power that is allocated by the UE to the first basestation, includes acquiring, by the first base station, the uplink pathloss between each base station and the UE that is sent by the secondbase station; and obtaining, by the first base station by calculation,from the maximum uplink transmit power of the UE and according to aproportion of each uplink path loss, the initial maximum uplink transmitpower that is allocated by the UE to the first base station.

In a seventeenth possible implementation manner of the first aspect, thefirst base station receives a sounding reference signal sent by the UE;the first base station determines an uplink path loss between the firstbase station and the UE according to a receive power and a transmitpower of the sounding reference signal; and the first base stationreports the uplink path loss between the first base station and the UEto the second base station, so that the second base station forwards theuplink path loss to other base stations.

With reference to the twelfth to seventeenth possible implementationmanners of the first aspect, in an eighteenth possible implementationmanner of the first aspect, after the acquiring, by the first basestation, the initial maximum uplink transmit power that is allocated bythe UE to the first base station, the method further includes adding, bythe first base station, a supplementary offset to the initial maximumuplink transmit power.

With reference to the twelfth to eighteenth possible implementationmanners of the first aspect, in a nineteenth possible implementationmanner of the first aspect, the acquiring, by the first base station,the initial maximum uplink transmit power that is allocated by the UE tothe first base station, includes acquiring, by the first base station,according to a set period, or when the uplink path loss or downlink pathloss changes, or when a path loss variation exceeds a set threshold, theinitial maximum uplink transmit power that is allocated by the UE to thefirst base station.

A second aspect provides a method for controlling an uplink transmitpower in inter-base station carrier aggregation, including providing, bya second base station for a first base station, a status of an uplinkresource that is scheduled by the second base station for user equipmentUE, so that the first base station determines, according to the statusof the uplink resource that is scheduled by the second base station forthe UE, a maximum uplink transmit power that is allocated by the UE tothe first base station; and scheduling, by the second base station, theuplink resource for the UE according to the status of the uplinkresource.

In a first possible implementation manner of the second aspect, thefirst base station is a secondary base station, and the second basestation is a master base station.

With reference to the second aspect and the first possibleimplementation manner of the second aspect, in a second possibleimplementation manner of the second aspect, the providing, by a secondbase station for a first base station, a status of an uplink resourcethat is scheduled by the second base station for the UE, includessending, by the second base station, the status of the uplink resourcethat is scheduled by the second base station for the UE, to the firstbase station; or sending, by the second base station, the status of theuplink resource that is scheduled by the second base station for the UE,to the first base station through the UE.

In a third possible implementation manner of the second aspect, thesending, by the second base station, the status of the uplink resourcethat is scheduled by the second base station for the UE, to the firstbase station through the UE, includes sending, by the second basestation, the status of the uplink resource that is scheduled by thesecond base station for the UE, to the UE by using a media accesscontrol element (MAC) control element (CE), a radio resource control RRCmessage, or uplink control information, so that the UE sends the statusof the uplink resource to the first base station.

With reference to the second aspect and the first possibleimplementation manner of the second aspect, in a fourth possibleimplementation manner of the second aspect, the providing, by a secondbase station for a first base station, a status of an uplink resourcethat is scheduled by the second base station for the UE, includes, whenestablishing a voice service for the UE, configuring, by the second basestation, semi-persistent scheduling of the uplink resource for the UE;and sending, by the second base station, semi-persistent schedulingconfiguration information to the first base station, or sendingsemi-persistent scheduling configuration information to the UE, so thatthe UE sends the semi-persistent scheduling configuration information tothe first base station.

In a fifth possible implementation manner of the second aspect, thesemi-persistent scheduling configuration information includes asemi-persistent scheduling SPS configuration command, an SPSconfiguration deletion command, an SPS activation instruction, and anSPS deactivation instruction.

With reference to the second aspect and the first to fifth possibleimplementation manners of the second aspect, in a sixth possibleimplementation manner of the second aspect, the method further includesconfiguring, by the second base station, preset power information, wherethe preset power information includes at least an uplink transmit powerthat is preconfigured by the second base station at a next time pointfor the UE; and sending, by the second base station, the preset powerinformation to the first base station, so that the first base stationdetermines, according to the preset power information, an uplinktransmit power that is configured by the first base station at the nexttime point for the UE.

In a seventh possible implementation manner of the second aspect, thepreset power information includes a maximum transmit power of the UE, amaximum transmit power allocated by the UE to the second base station,an uplink control information scheduling status of the UE, a maximumtransmit power allocated by the UE to each carrier of the second basestation, and an offset of an uplink transmit power used by the secondbase station.

With reference to the second aspect and the first to seventh possibleimplementation manners of the second aspect, in an eighth possibleimplementation manner of the second aspect, the method further includesacquiring, by the second base station, an initial maximum uplinktransmit power that is allocated by the UE to the second base station,where the initial maximum uplink transmit power is determined accordingto a downlink path loss or an uplink path loss between each base stationand the UE; and allocating, by the second base station, an uplinktransmit power to the UE according to the initial maximum uplinktransmit power.

In a ninth possible implementation manner of the second aspect, theacquiring, by the second base station, an initial maximum uplinktransmit power that is allocated by the UE to the second base station,includes receiving, by the second base station, the initial maximumuplink transmit power that is allocated by the UE to the second basestation and reported by the UE, where the initial maximum uplinktransmit power is allocated by the UE from the maximum uplink transmitpower of the UE according to a proportion of the downlink path lossbetween each base station and the UE.

With reference to the eighth possible implementation manner of thesecond aspect, in a tenth possible implementation manner of the secondaspect, the method further includes receiving, by the second basestation, an initial maximum uplink transmit power that is allocated bythe UE to each base station and reported by the UE; or receiving, by thesecond base station, the downlink path loss of each base station that isreported by the UE, and obtaining by calculation, from the maximumuplink transmit power of the UE according to a proportion of eachdownlink path loss, an initial maximum uplink transmit power that isallocated by the UE to each base station; and sending, by the secondbase station, each initial maximum uplink transmit power to acorresponding base station.

With reference to the eighth possible implementation manner of thesecond aspect, in an eleventh possible implementation manner of thesecond aspect, the acquiring, by the second base station, an initialmaximum uplink transmit power that is allocated by the UE to the secondbase station, includes acquiring, by the second base station, the uplinkpath loss between each base station and the UE that is sent by each basestation; obtaining, by the second base station by calculation, from themaximum uplink transmit power of the UE and according to a proportion ofeach uplink path loss, an initial maximum uplink transmit power that isallocated by the UE to each base station; and sending, by the secondbase station, each initial maximum uplink transmit power to acorresponding base station.

In a twelfth possible implementation manner of the second aspect, themethod further includes: receiving, by the second base station, asounding reference signal sent by the UE; and determining, by the secondbase station, an uplink path loss between the second base station andthe UE according to a receive power and a transmit power of the soundingreference signal.

With reference to the tenth to twelfth possible implementation mannersof the second aspect, in a thirteenth possible implementation manner ofthe second aspect, after the obtaining, by the second base station, aninitial maximum uplink transmit power that is allocated by the UE toeach base station, the method further includes adding, by the secondbase station, a supplementary offset to an initial maximum uplinktransmit power that is allocated to the secondary base station.

With reference to the eighth to thirteenth possible implementationmanners of the second aspect, in a fourteenth possible implementationmanner of the second aspect, the acquiring, by the second base station,an initial maximum uplink transmit power that is allocated by the UE tothe second base station, includes acquiring, by the second base station,according to a set period, or when the uplink path loss or downlink pathloss changes, or when a path loss variation exceeds a set threshold, theinitial maximum uplink transmit power that is allocated by the UE to thesecond base station.

A third aspect provides a method for controlling an uplink transmitpower in inter-base station carrier aggregation. The method includesacquiring, by user equipment UE, a status of an uplink resource that isscheduled by a second base station for the UE; and reporting, by the UE,the status of the uplink resource that is scheduled by the second basestation for the UE, to a first base station, so that the first basestation determines, according to the status of the uplink resource, amaximum uplink transmit power that is allocated by the UE to the firstbase station; or determining, by the UE, according to the status of theuplink resource that is scheduled by the second base station for the UE,a maximum uplink transmit power that is allocated by the UE to the firstbase station, and reporting the maximum uplink transmit power to thefirst base station.

In a first possible implementation manner of the third aspect, the firstbase station is a secondary base station, and the second base station isa master base station.

With reference to the third aspect and the first possible implementationmanner of the third aspect, in a second possible implementation mannerof the third aspect, the determining, by the UE, according to the statusof the uplink resource that is scheduled by the second base station forthe UE, a maximum uplink transmit power that is allocated by the UE tothe first base station, includes determining, by the UE, an offset of anuplink transmit power according to the status of the uplink resourcethat is scheduled by the second base station for the UE; and adding, bythe UE, the offset to an initial maximum uplink transmit power that isallocated by the UE to the first base station, and determining that asum of the offset and the initial maximum uplink transmit power is themaximum uplink transmit power allocated by the UE to the first basestation.

In a third possible implementation manner of the third aspect, a valueof the offset is preconfigured, or is delivered by the second basestation by using network signaling.

With reference to the third aspect and the first to third possibleimplementation manners of the third aspect, in a fourth possibleimplementation manner of the third aspect, the method further includesreceiving, by the UE, the status that is of the uplink resource and issent by using a media access control element MAC CE, a radio resourcecontrol RRC message, or uplink control information by the second basestation; or receiving, by the UE, a semi-persistent scheduling SPSconfiguration command, an SPS configuration deletion command, an SPSactivation instruction, and an SPS deactivation instruction that aresent by the second base station, and using the commands and instructionsas the status of the uplink resource; or identifying, by the UE, whetherthe second base station does not schedule the uplink resource within aset time, and determining the status of the uplink resource according toan identification result.

With reference to the third aspect and the first to fourth possibleimplementation manners of the third aspect, in a fifth possibleimplementation manner of the third aspect, the method further includesreporting, by the UE, a downlink path loss between the UE and a basestation to the base station, so that the base station determines,according to the downlink path loss, an initial maximum uplink transmitpower that is allocated by the UE to the base station; or determining,by the UE, according to a downlink path loss between the UE and a basestation, an initial maximum uplink transmit power that is allocated bythe UE to the base station, and reporting the initial maximum uplinktransmit power to the base station.

In a sixth possible implementation manner of the third aspect, thereporting, by the UE, a downlink path loss between the UE and a basestation to the base station, includes measuring, by the UE, a downlinkpath loss between the UE and each base station, and reporting, by theUE, the downlink path loss between the UE and each base station to thesecond base station.

With reference to the fifth possible implementation manner of the thirdaspect, in a seventh possible implementation manner of the third aspect,the determining, by the UE, according to a downlink path loss betweenthe UE and a base station, an initial maximum uplink transmit power thatis allocated by the UE to the base station, and reporting the initialmaximum uplink transmit power to the base station, includes measuring,by the UE, a downlink path loss between the UE and each base station;and obtaining, by the UE by calculation, from a maximum uplink transmitpower of the UE and according to a proportion of the downlink path lossbetween the UE and each base station, an initial maximum uplink transmitpower allocated to each base station; and reporting, by the UE, thedetermined initial maximum uplink transmit power to each base station,or reporting the determined initial maximum uplink transmit power to thesecond base station, so that the second base station forwards thedetermined initial maximum uplink transmit power to each base station.

With reference to the sixth or seventh possible implementation manner ofthe third aspect, in an eighth possible implementation manner of thethird aspect, the measuring, by the UE, a downlink path loss between theUE and each base station, includes receiving, by the UE, a soundingreference signal sent by each base station, and determining the downlinkpath loss between the UE and each base station according to a receivepower and a transmit power of the sounding reference signal.

With reference to the seventh possible implementation manner of thethird aspect, in a ninth possible implementation manner of the thirdaspect, after the obtaining, by the UE by calculation, from a maximumuplink transmit power of the UE and according to a proportion of thedownlink path loss between the UE and each base station, an initialmaximum uplink transmit power allocated to each base station, the methodfurther includes adding, by the UE, a supplementary offset to themaximum uplink transmit power that is allocated to the first basestation.

With reference to the fifth to ninth possible implementation manners ofthe third aspect, in a tenth possible implementation manner of the thirdaspect, the UE acquires, according to a set period, or when the uplinkpath loss or downlink path loss changes, or when a path loss variationexceeds a set threshold, the initial maximum uplink transmit power thatis allocated by the UE to each base station.

A fourth aspect provides a first base station, including a poweracquiring module, configured to acquire a maximum uplink transmit powerthat is allocated by user equipment UE to the first base station, wherethe maximum uplink transmit power is determined according to a status ofan uplink resource that is scheduled by a second base station for theUE; and a power determining module, configured to configure an uplinktransmit power for the UE according to the maximum uplink transmitpower.

In a first possible implementation manner of the fourth aspect, thefirst base station is a secondary base station, and the second basestation is a master base station.

With reference to the fourth aspect and the first possibleimplementation manner of the fourth aspect, in a second possibleimplementation manner of the fourth aspect, the power acquiring moduleincludes an uplink resource status receiving unit, configured toreceive, from the second base station or the UE, the status of theuplink resource that is scheduled by the second base station for the UE;and an uplink transmit power determining unit, configured to determine,according to the status of the uplink resource that is scheduled by thesecond base station for the UE, the maximum uplink transmit power thatis allocated by the UE to the first base station.

With reference to the fourth aspect and the first possibleimplementation manner of the fourth aspect, in a third possibleimplementation manner of the fourth aspect, the power acquiring moduleis specifically configured to receive, from the second base station orthe UE, the maximum uplink transmit power that is allocated by the UE tothe first base station, where the maximum uplink transmit power isdetermined by the second base station or the UE according to the statusof the uplink resource that is scheduled by the second base station forthe UE.

With reference to the second or third possible implementation manner ofthe fourth aspect, in a fourth possible implementation manner of thefourth aspect, the status of the uplink resource is semi-persistentscheduling configuration information of the uplink resource that isscheduled for the UE when the second base station establishes a voiceservice for the UE.

In a fifth possible implementation manner of the fourth aspect, thesemi-persistent scheduling configuration information includes asemi-persistent scheduling SPS configuration command, an SPSconfiguration deletion command, an SPS activation instruction, and anSPS deactivation instruction.

With reference to the second possible implementation manner of thefourth aspect, in a sixth possible implementation manner of the fourthaspect, the power determining module includes a power offset determiningunit, configured to determine an offset of an uplink transmit poweraccording to the status of the uplink resource that is scheduled by thesecond base station for the UE; and a power determining unit, configuredto add the offset to an initial maximum uplink transmit power that isallocated by the UE to the first base station, and determine that a sumof the offset and the initial maximum uplink transmit power is themaximum uplink transmit power allocated by the UE to the first basestation.

In a seventh possible implementation manner of the fourth aspect, thepower offset determining unit is specifically configured to determinethe offset of the uplink transmit power when identifying, according tothe status of the uplink resource that is scheduled by the second basestation for the UE, that an uplink resource scheduled by the second basestation for the UE at a current time point is lower than a setthreshold.

In an eighth possible implementation manner of the fourth aspect, avalue of the offset is preconfigured.

With reference to the fourth aspect and the first and second possibleimplementation manners of the fourth aspect, in a ninth possibleimplementation manner of the fourth aspect of the present invention, thebase station further includes a power headroom determining module,configured to: when the uplink transmit power determined by the firstbase station changes compared with a historical value, or when avariation exceeds a preset threshold, acquire a power headroom of the UEthat is recalculated according to the maximum uplink transmit power.

With reference to the fourth aspect and the first to ninth possibleimplementation manners of the fourth aspect, in a tenth possibleimplementation manner of the fourth aspect, the base station furtherincludes a preset power receiving module, configured to receive presetpower information sent by the second base station, where the presetpower information includes at least an uplink transmit power that ispreconfigured by the second base station at a next time point for theUE; and a preset power configuring module, configured to determine,according to the preset power information, an uplink transmit power thatis configured by the first base station at the next time point for theUE.

In an eleventh possible implementation manner of the fourth aspect, thepreset power information includes a maximum transmit power of the UE, amaximum transmit power allocated by the UE to the second base station,an uplink control information scheduling status of the UE, a maximumtransmit power allocated by the UE to each carrier of the second basestation, and an offset of an uplink transmit power used by the secondbase station.

With reference to the fourth aspect and the first to eleventh possibleimplementation manners of the fourth aspect, in a twelfth possibleimplementation manner of the fourth aspect, the base station furtherincludes an initial maximum uplink transmit power acquiring module,configured to acquire the initial maximum uplink transmit power that isallocated by the UE to the first base station, where the initial maximumuplink transmit power is determined according to a downlink path loss oran uplink path loss between each base station and the UE; and a powerallocating module, configured to allocate an uplink transmit power tothe UE according to the initial maximum uplink transmit power.

In a thirteenth possible implementation manner of the fourth aspect, theinitial maximum uplink transmit power acquiring module is specificallyconfigured to receive the initial maximum uplink transmit power that isallocated by the UE to the first base station and reported by the UE,where the initial maximum uplink transmit power is allocated by the UEfrom the maximum uplink transmit power of the UE according to aproportion of the downlink path loss between each base station and theUE.

With reference to the twelfth possible implementation manner of thefourth aspect, in a fourteenth possible implementation manner of thefourth aspect, the initial maximum uplink transmit power acquiringmodule is specifically configured to receive the initial maximum uplinktransmit power that is allocated by the UE to the first base station andsent by the second base station, where the initial maximum uplinktransmit power is allocated by the second base station from the maximumuplink transmit power of the UE according to a proportion of thedownlink path loss between each base station and the UE.

With reference to the twelfth possible implementation manner of thefourth aspect, in a fifteenth possible implementation manner of thefourth aspect, the initial maximum uplink transmit power acquiringmodule is specifically configured to receive the downlink path loss ofeach base station that is reported by the UE, and obtain by calculation,from the maximum uplink transmit power of the UE and according to aproportion of each downlink path loss, the initial maximum uplinktransmit power that is allocated by the UE to the first base station.

With reference to the twelfth possible implementation manner of thefourth aspect, in a sixteenth possible implementation manner of thefourth aspect, the initial maximum uplink transmit power acquiringmodule is specifically configured to acquire the uplink path lossbetween each base station and the UE that is sent by the second basestation, and obtain by calculation, from the maximum uplink transmitpower of the UE and according to a proportion of each uplink path loss,the initial maximum uplink transmit power that is allocated by the UE tothe first base station.

In a seventeenth possible implementation manner of the fourth aspect, inclaim 64, the base station according to claim 63 further includes areference signal receiving module, configured to receive a soundingreference signal sent by the UE; an uplink path loss determining module,configured to determine an uplink path loss between the first basestation and the UE according to a receive power and a transmit power ofthe sounding reference signal; and a path loss reporting module,configured to report the uplink path loss between the first base stationand the UE to the second base station, so that the second base stationforwards the uplink path loss to other base stations.

With reference to the twelfth to seventeenth possible implementationmanners of the fourth aspect, in an eighteenth possible implementationmanner of the fourth aspect, the initial maximum uplink transmit poweracquiring module is further configured to add a supplementary offset tothe initial maximum uplink transmit power after acquiring the initialmaximum uplink transmit power that is allocated by the UE to the firstbase station.

With reference to the twelfth to eighteenth possible implementationmanners of the fourth aspect, in a nineteenth possible implementationmanner of the fourth aspect, the initial maximum uplink transmit poweracquiring module is configured to acquire, according to a set period, orwhen the uplink path loss or downlink path loss changes, or when a pathloss variation exceeds a set threshold, the initial maximum uplinktransmit power that is allocated by the UE to the first base station.

A fifth aspect provides a second base station, including an uplinkresource status providing module, configured to provide, for a firstbase station, a status of an uplink resource that is scheduled by thesecond base station for user equipment UE, so that the first basestation determines, according to the status of the uplink resource thatis scheduled by the second base station for the UE, a maximum uplinktransmit power that is allocated by the UE to the first base station;and an uplink resource scheduling module, configured to schedule theuplink resource for the UE according to the status of the uplinkresource.

In a first possible implementation manner of the fifth aspect, the firstbase station is a secondary base station, and the second base station isa master base station.

With reference to the fifth aspect and the first possible implementationmanner of the fifth aspect, in a second possible implementation mannerof the fifth aspect, the uplink resource status providing module isspecifically configured to send the status of the uplink resource thatis scheduled by the second base station for the UE, to the first basestation; or send the status of the uplink resource that is scheduled bythe second base station for the UE, to the first base station throughthe UE.

In a third possible implementation manner of the fifth aspect, theuplink resource status providing module is specifically configured tosend the status of the uplink resource that is scheduled by the secondbase station for the UE, to the UE by using a media access controlelement MAC CE, a radio resource control RRC message, or uplink controlinformation, so that the UE sends the status of the uplink resource tothe first base station.

With reference to the fifth aspect and the first possible implementationmanner of the fifth aspect, in a fourth possible implementation mannerof the fifth aspect, the uplink resource status providing module isspecifically configured to, when establishing a voice service for theUE, configure semi-persistent scheduling of the uplink resource for theUE, and send semi-persistent scheduling configuration information to thefirst base station, or send semi-persistent scheduling configurationinformation to the UE, so that the UE sends the semi-persistentscheduling configuration information to the first base station.

In a fifth possible implementation manner of the fifth aspect, thesemi-persistent scheduling configuration information includes asemi-persistent scheduling SPS configuration command, an SPSconfiguration deletion command, an SPS activation instruction, and anSPS deactivation instruction.

With reference to the fifth aspect and the first to fifth possibleimplementation manners of the fifth aspect, in a sixth possibleimplementation manner of the fifth aspect, the base station furtherincludes a preset power configuring module, configured to configurepreset power information, where the preset power information includes atleast an uplink transmit power that is preconfigured by the second basestation at a next time point for the UE; and a preset power informationsending module, configured to send the preset power information to thefirst base station, so that the first base station determines, accordingto the preset power information, an uplink transmit power that isconfigured by the first base station at the next time point for the UE.

In a seventh possible implementation manner of the fifth aspect, thepreset power information includes a maximum transmit power of the UE, amaximum transmit power allocated by the UE to the second base station,an uplink control information scheduling status of the UE, a maximumtransmit power allocated by the UE to each carrier of the second basestation, and an offset of an uplink transmit power used by the secondbase station.

With reference to the fifth aspect and the first to seventh possibleimplementation manners of the fifth aspect, in an eighth possibleimplementation manner of the fifth aspect, the base station furtherincludes an initial maximum uplink transmit power acquiring module,configured to acquire an initial maximum uplink transmit power that isallocated by the UE to the second base station, where the initialmaximum uplink transmit power is determined according to a downlink pathloss or an uplink path loss between each base station and the UE; and apower allocating module, configured to allocate an uplink transmit powerto the UE according to the initial maximum uplink transmit power.

In a ninth possible implementation manner of the fifth aspect, theinitial maximum uplink transmit power module is specifically configuredto receive the initial maximum uplink transmit power that is allocatedby the UE to the second base station and reported by the UE, where theinitial maximum uplink transmit power is allocated by the UE from themaximum uplink transmit power of the UE according to a proportion of thedownlink path loss between each base station and the UE.

With reference to the eighth possible implementation manner of the fifthaspect, in a tenth possible implementation manner of the fifth aspect,the initial maximum uplink transmit power acquiring module isspecifically configured to receive an initial maximum uplink transmitpower that is allocated by the UE to each base station and reported bythe UE; or receive the downlink path loss of each base station that isreported by the UE, and obtain by calculation, from the maximum uplinktransmit power of the UE and according to a proportion of each downlinkpath loss, an initial maximum uplink transmit power that is allocated bythe UE to each base station. The base station further includes aninitial maximum uplink transmit power sending module, configured to sendeach initial maximum uplink transmit power to a corresponding basestation.

With reference to the eighth possible implementation manner of the fifthaspect, in an eleventh possible implementation manner of the fifthaspect, the initial maximum uplink transmit power acquiring moduleincludes an uplink path loss acquiring unit, configured to acquire theuplink path loss between each base station and the UE that is sent byeach base station; and an initial maximum uplink transmit powerallocating unit, configured to obtain by calculation, from the maximumuplink transmit power of the UE and according to a proportion of eachuplink path loss, an initial maximum uplink transmit power that isallocated by the UE to each base station; and the initial maximum uplinktransmit power sending module is configured to send each initial maximumuplink transmit power to a corresponding base station.

In a twelfth possible implementation manner of the fifth aspect, thebase station further includes a reference signal receiving module,configured to receive a sounding reference signal sent by the UE; and anuplink path loss determining module, configured to determine an uplinkpath loss between the second base station and the UE according to areceive power and a transmit power of the sounding reference signal.

With reference to the tenth to twelfth possible implementation mannersof the fifth aspect, in a thirteenth possible implementation manner ofthe fifth aspect, the initial maximum uplink transmit power acquiringmodule is further configured to add a supplementary offset to an initialmaximum uplink transmit power that is allocated to the secondary basestation after obtaining the initial maximum uplink transmit power thatis allocated by the UE to each base station.

With reference to the eighth to thirteenth possible implementationmanners of the fifth aspect, in a fourteenth possible implementationmanner of the fifth aspect, the initial maximum uplink transmit poweracquiring module acquires, according to a set period, or when the uplinkpath loss or downlink path loss changes, or when a path loss variationexceeds a set threshold, the initial maximum uplink transmit power thatis allocated by the UE to the second base station.

A sixth aspect provides user equipment UE, including an uplink resourcestatus acquiring module, configured to acquire a status of an uplinkresource that is scheduled by a second base station for the UE; and anuplink resource status reporting module, configured to report the statusof the uplink resource that is scheduled by the second base station forthe UE, to a first base station, so that the first base stationdetermines, according to the status of the uplink resource, a maximumuplink transmit power that is allocated by the UE to the first basestation; or determine, according to the status of the uplink resourcethat is scheduled by the second base station for the UE, a maximumuplink transmit power that is allocated by the UE to the first basestation, and report the maximum uplink transmit power to the first basestation.

In a first possible implementation manner of the sixth aspect, the firstbase station is a secondary base station, and the second base station isa master base station.

With reference to the sixth aspect and the first possible implementationmanner of the sixth aspect, in a second possible implementation mannerof the sixth aspect, the uplink resource status reporting moduleincludes: a power offset determining unit, configured to determine anoffset of an uplink transmit power according to the status of the uplinkresource that is scheduled by the second base station for the UE; and atransmit power determining unit, configured to add the offset to aninitial maximum uplink transmit power that is allocated by the UE to thefirst base station, and determine that a sum of the offset and theinitial maximum uplink transmit power is the maximum uplink transmitpower allocated by the UE to the first base station.

In a third possible implementation manner of the sixth aspect, a valueof the offset is preconfigured, or is delivered by the second basestation by using network signaling.

With reference to the sixth aspect and the first to third possibleimplementation manners of the sixth aspect, in a fourth possibleimplementation manner of the sixth aspect, the uplink resource statusacquiring module is specifically configured to receive the status thatis of the uplink resource and is sent by using a media access controlelement MAC CE, a radio resource control RRC message, or uplink controlinformation by the second base station; or receive a semi-persistentscheduling SPS configuration command, an SPS configuration deletioncommand, an SPS activation instruction, and an SPS deactivationinstruction that are sent by the second base station, and use thecommands and instructions as the status of the uplink resource; oridentify whether the second base station does not schedule the uplinkresource within a set time, and determine the status of the uplinkresource according to an identification result.

With reference to the sixth aspect and the first to fourth possibleimplementation manners of the sixth aspect, in a fifth possibleimplementation manner of the sixth aspect, the UE further includes anuplink path loss reporting module and an initial maximum uplink transmitpower determining module, where the uplink path loss reporting module isconfigured to report a downlink path loss between the UE and a basestation to the base station, so that the base station determines,according to the downlink path loss, an initial maximum uplink transmitpower that is allocated by the UE to the base station; and the initialmaximum uplink transmit power determining module is configured todetermine, according to a downlink path loss between the UE and a basestation, an initial maximum uplink transmit power that is allocated bythe UE to the base station, and report the initial maximum uplinktransmit power to the base station.

In a sixth possible implementation manner of the sixth aspect, theuplink path loss reporting module includes a downlink path lossmeasuring unit, configured to measure a downlink path loss between theUE and each base station; and a downlink path loss reporting unit,configured to report the downlink path loss between the UE and each basestation to the second base station.

With reference to the fifth possible implementation manner of the sixthaspect, in a seventh possible implementation manner of the sixth aspect,the initial maximum uplink transmit power determining module includes adownlink path loss measuring unit, configured to measure a downlink pathloss between the UE and each base station; an initial maximum uplinktransmit power allocating unit, configured to obtain by calculation,from a maximum uplink transmit power of the UE, an initial maximumuplink transmit power that is allocated to each base station; and aninitial maximum uplink transmit power reporting unit, configured toreport the determined initial maximum uplink transmit power to each basestation, or report the determined initial maximum uplink transmit powerto the second base station, so that the second base station forwards thedetermined initial maximum uplink transmit power to each base station.

With reference to the sixth or seventh possible implementation manner ofthe sixth aspect, in an eighth possible implementation manner of thesixth aspect, the downlink path loss measuring unit is specificallyconfigured to receive a sounding reference signal sent by each basestation, and determine the downlink path loss between the UE and eachbase station according to a receive power and a transmit power of thesounding reference signal.

With reference to the seventh possible implementation manner of thesixth aspect, in a ninth possible implementation manner of the sixthaspect, the initial maximum uplink transmit power allocating unit isfurther configured to add a supplementary offset to the maximum uplinktransmit power that is allocated to the first base station.

With reference to the fifth to ninth possible implementation manners ofthe sixth aspect, in a tenth possible implementation manner of the sixthaspect, the initial maximum uplink transmit power determining moduleacquires, according to a set period, or when the uplink path loss ordownlink path loss changes, or when a path loss variation exceeds a setthreshold, the initial maximum uplink transmit power that is allocatedby the UE to each base station.

A seventh aspect provides a first base station, including a processorand a memory, where: the memory stores an execution instruction; whenthe first base station runs, the processor communicates with the memory;and the processor executes the execution instruction so that the firstbase station executes the method according to the first aspect and anyone of the first to nineteenth possible implementation manners of thefirst aspect.

An eighth aspect provides a second base station, including a processorand a memory, where: the memory stores an execution instruction; whenthe second base station runs, the processor communicates with thememory; and the processor executes the execution instruction so that thesecond base station executes the method according to the second aspectand any one of the first to thirteenth possible implementation mannersof the second aspect.

A ninth aspect provides user equipment UE, including a processor and amemory, where: the memory stores an execution instruction; when the UEruns, the processor communicates with the memory; and the processorexecutes the execution instruction so that the UE executes the methodaccording to the third aspect and any one of the first to ninth possibleimplementation manners of the third aspect.

In a method provided by an embodiment, when a first base stationallocates a transmit power to UE, the first base station performsallocation according to a maximum transmit power that is allocated bythe UE to the first base station. Because the maximum transmit powerallocated to the first base station is allocated according to statusinformation of an uplink resource of a second base station, a power thatis allocated by the UE to each base station can be coordinated.Therefore, the first base station can accurately allocate an uplinktransmit power to the UE, and a throughput of the UE is increased whilerequirements of multiple base stations for transmit powers aresatisfied.

BRIEF DESCRIPTION OF THE DRAWINGS

To describe the technical solutions in the embodiments of the presentinvention more clearly, the following briefly introduces theaccompanying drawings required for describing the embodiments.Apparently, the accompanying drawings in the following description showmerely some embodiments of the present invention, and persons ofordinary skill in the art may still derive other drawings from theseaccompanying drawings without creative efforts.

FIG. 1 is a flowchart of Embodiment 1 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 2 is a flowchart of Embodiment 2 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 3 is a flowchart of Embodiment 3 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 4 is a flowchart of Embodiment 4 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 5 is a flowchart of Embodiment 5 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 6 is a flowchart of Embodiment 6 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 7 is a flowchart of Embodiment 7 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 8 is a flowchart of Embodiment 8 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 9 is a flowchart of Embodiment 9 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 10 is a flowchart of Embodiment 10 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 11 is a flowchart of Embodiment 11 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording to an embodiment;

FIG. 12 is a schematic structural diagram of Embodiment 1 of a firstbase station;

FIG. 13 is a schematic structural diagram of Embodiment 2 of a firstbase station;

FIG. 14 is a schematic structural diagram of Embodiment 3 of a firstbase station;

FIG. 15 is a schematic structural diagram of Embodiment 4 of a secondbase station;

FIG. 16 is a schematic structural diagram of Embodiment 5 of a secondbase station;

FIG. 17 is a schematic structural diagram of Embodiment 6 of userequipment UE;

FIG. 18 is a schematic structural diagram of Embodiment 7 of userequipment UE;

FIG. 19 is a schematic structural diagram of Embodiment 8 of a firstbase station;

FIG. 20 is a schematic structural diagram of Embodiment 9 of a secondbase station; and

FIG. 21 is a schematic structural diagram of Embodiment 10 of userequipment UE.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

The following clearly describes the technical solutions in theembodiments of the present invention with reference to the accompanyingdrawings in the embodiments of the present invention. Apparently, thedescribed embodiments are merely some but not all of the embodiments ofthe present invention. All other embodiments obtained by persons ofordinary skill in the art based on the embodiments of the presentinvention without creative efforts shall fall within the protectionscope of the present invention.

FIG. 1 is a flowchart of Embodiment 1 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. In theembodiment, UE may receive data from multiple cells of two base stationssimultaneously, where there are a master base station and a secondarybase station. The master base station has a function of main control,and controls selection of a secondary base station, a data offloadpolicy, and the like; the secondary base station mainly has a functionof data offload and is configured to increase data traffic. Generally,inter-base station carrier aggregation may include a master base stationand multiple secondary base stations. In this embodiment, the masterbase station and the secondary base station are only logical concepts.In a process of establishing a connection by UE, a master base stationand a secondary base station are distinguished for the UE. However, froma perspective of a base station itself, the base station may be either amaster base station or a secondary base station for different UEs, andcan either execute a function of a master base station or execute afunction of a secondary base station. The concepts about the master basestation and the secondary base station in this embodiment are alsoapplicable to other embodiments. The method provided by the presentinvention is executed by an apparatus for controlling an uplink transmitpower in inter-base station carrier aggregation, where the apparatus isintegrated in a base station. The method provided by this embodimentincludes the following steps.

Step 101: A first base station acquires a maximum uplink transmit powerthat is allocated by UE to the first base station, where the maximumuplink transmit power is determined according to a status of an uplinkresource that is scheduled by a second base station for the UE.

In this embodiment, that a first base station acquires a maximum uplinktransmit power that is allocated by UE to the first base station isspecifically that the first base station receives, from the second basestation or the UE, the status of the uplink resource that is scheduledby the second base station for the UE, and the first base stationdetermines, according to the status of the uplink resource that isscheduled by the second base station for the UE, the maximum uplinktransmit power that is allocated by the UE to the first base station.Alternatively, the first base station receives, from the second basestation or the UE, the maximum uplink transmit power that is allocatedby the UE to the first base station, where the maximum uplink transmitpower is determined by the second base station or the UE according tothe status of the uplink resource that is scheduled by the second basestation for the UE.

The status of the uplink resource may be semi-persistent schedulingconfiguration information of the uplink resource that is scheduled forthe UE when the second base station establishes a voice service for theUE. The semi-persistent scheduling configuration information may includea semi-persistent scheduling (SPS for short) configuration command, anSPS configuration deletion command, an SPS activation instruction, andan SPS deactivation instruction.

The status information of the uplink resource may also be the statusthat is of the uplink resource and is sent by using a media accesscontrol element MAC CE for short), a radio resource control (RRC forshort) message, or uplink control information by the second basestation. Specifically, the second base station may decide, according toa sending status of uplink data, not to schedule uplink data of the UEin a period of time. Therefore, the status of the uplink resourceincludes a time and an indication of not scheduling uplink data by thesecond base station, or not scheduling uplink control information of theUE, such as a physical uplink control channel (PUCCH for short). The UEcan allocate the maximum uplink transmit power to the first base stationproperly according to the status of the uplink resource of the secondbase station. Specifically, because the second base station does notschedule uplink data in a period of time, a part or all of a transmitpower allocated previously to the second base station may be allocatedto the first base station, so as to increase a transmit power of thefirst base station.

Step 102: The first base station configures an uplink transmit power forthe UE according to the maximum uplink transmit power.

After acquiring the maximum uplink transmit power allocated by the UE,the first base station configures the uplink transmit power for the UEproperly according to the maximum uplink transmit power allocated by theUE, and controls the uplink transmit power allocated to the UE not toexceed a maximum uplink transmit power of the UE, or properly reduces atransmit power of the UE.

In the method provided by this embodiment, when a first base stationallocates a transmit power to UE, the first base station performsallocation according to a maximum transmit power that is allocated bythe UE to the first base station. Because the maximum transmit powerallocated to the first base station is allocated according to statusinformation of an uplink resource of a second base station, a power thatis allocated by the UE to each base station can be coordinated.Therefore, the first base station can accurately allocate an uplinktransmit power to the UE, and a throughput of the UE is increased whilerequirements of multiple base stations for transmit powers aresatisfied. Because statuses of uplink resources configured by other basestations are considered between base stations, a phenomenon of waste ofthe allocated uplink transmit power may be reduced, and even avoided,thereby improving transmission efficiency.

In this embodiment, the first base station may be a secondary basestation, and the second base station may be a master base station. Thesecondary base station allocates an uplink transmit power according to astatus of an uplink resource of the master base station. However, in anactual application, a contrary case may occur; the master base stationmay also allocate an uplink transmit power according to a status of anuplink resource of the secondary base station, or multiple secondarybase stations mutually consider statuses of uplink resources of otherbase stations.

FIG. 2 is a flowchart of Embodiment 2 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. In thisembodiment, a first base station is a secondary base station, and asecond base station is a master base station. However, persons skilledin the art may understand that it is also applicable that the first basestation is a master base station and the second base station is asecondary base station. This embodiment provides a method forallocating, in a semi-persistent manner, an uplink transmit power of UEbetween base stations. The method provided by this embodimentspecifically includes the following steps.

Step 201: A first base station receives, from a second base station orUE, semi-persistent scheduling configuration information that isscheduled by the second base station for the UE.

In this embodiment, a status of an uplink resource that is scheduled bythe second base station for the UE is semi-persistent scheduling (SPS)configuration information of the uplink resource that is scheduled forthe UE when the second base station establishes a voice service for theUE. The semi-persistent scheduling configuration information includes anSPS configuration command, an SPS configuration deletion command, an SPSactivation instruction, and an SPS deactivation instruction.

A semi-persistent scheduling manner is generally applied to a real-timeservice whose data packet size is relatively fixed and whose arrivaltime interval satisfies a rule, for example, a voice (Voice overInternet Protocol, VoIP for short) service implemented by sending IPdata packets. In initial scheduling, a base station indicates currentscheduling information to the UE by using a physical downlink controlchannel (PDCCH for short). The UE identifies semi-persistent scheduling,and therefore stores the current scheduling information, and sends orreceives the service data in a same time-frequency resource position atan interval of a fixed period. Semi-persistent scheduling transmissionmay fully use a feature of periodic arrival of a voice data packet, anda resource is granted for periodic use, which may save a PDCCH resourcethat is used by an LTE system for a scheduling instruction. In aninitial phase of service establishment, RRC configures relatedsemi-persistent scheduling parameters, such as a semi-persistenttransmission time interval, a radio network identifier of asemi-persistent cell, and an uplink transmit power.

Using a typical VoIP service as an example, an arrival period of a datapacket of the VoIP service is 20 ms; therefore, the base stationprovides a semi-persistent scheduling instruction for the UE by using aPDCCH; the UE transmits or receives, according to the instruction of thePDCCH, data scheduled at a current time point, and after an interval of20 ms, transmits or receives a newly arrived VoIP data packet in a sametime-frequency resource position.

In this embodiment, the second base station delivers an SPSconfiguration. When establishing a VoIP bearer, the second base stationdelivers the SPS configuration to the UE by using an RRC reconfigurationmessage, and meanwhile may send the SPS configuration to the first basestation by using an interface message between the second base stationand the first base station, where the SPS configuration may include asemi-persistent transmission time interval, a radio network identifierof a semi-persistent scheduling cell (SPS-C-RNTI), an uplink transmitpower, and the like.

After acquiring the SPS configuration, the first base station furtherneeds to acquire an SPS status, where the SPS status includes twostates, activation/deactivation. The first base station parses thereceived semi-persistent configuration information to acquire the SPSstatus. The following uses a specific example to describe how the firstbase station acquires the SPS status.

The UE parses the PDCCH by using the SPS-C-RNTI, to acquire an SPSactivation instruction, and provides the SPS activation instruction tothe first base station, or the second base station sends an SPSactivation instruction to the first base station when delivering the SPSactivation instruction to the UE.

For the SPS deactivation state, the UE has two manners, implicitdeactivation and explicit deactivation, where the implicit deactivationmeans that the UE itself decides deactivation according to an actualrequirement, and the explicit deactivation means that the UE executes adeactivation operation only after receiving a deactivation instructionsent by the second base station. When the UE performs implicitdeactivation, the UE directly sends an SPS deactivation instruction tothe first base station. When the UE performs explicit deactivation, thesecond base station also sends an SPS deactivation instruction to thefirst base station when sending the SPS deactivation instruction to theUE.

The second base station may further cancel a semi-persistent schedulingmanner by delivering an SPS configuration deletion command. When the UEreceives the SPS configuration deletion command delivered by the secondbase station, where the SPS configuration deletion command is generallyincluded in an RRC reconfiguration message, the UE may send the SPSconfiguration deletion command to the first base station, or when thesecond base station delivers the SPS configuration deletion command tothe UE, the second base station also delivers the SPS configurationdeletion command to the first base station, indicating to the first basestation that the SPS configuration is released.

In this embodiment, the UE may send various types of SPS instructioninformation to the first base station by using a newly defined MAC CE orRRC message. The second base station sends various types of instructioninformation to the first base station by using interface messagesbetween the second base station and the first base station.

Step 202: The first base station determines, according to thesemi-persistent scheduling configuration information that is scheduledby the second base station for the UE, a maximum uplink transmit powerthat is allocated by the UE to the first base station.

That the first base station determines, according to the semi-persistentscheduling configuration information that is scheduled by the secondbase station for the UE, a maximum uplink transmit power that isallocated by the UE to the first base station is specifically that: thefirst base station determines an offset of an uplink transmit poweraccording to the semi-persistent scheduling configuration informationthat is scheduled by the second base station for the UE; and the firstbase station adds the offset to an initial maximum uplink transmit powerthat is allocated by the UE to the first base station, and determinesthat a sum of the offset and the initial maximum uplink transmit poweris the maximum uplink transmit power allocated by the UE to the firstbase station. It is understandable that the offset may also be zero,that is, no offset needs to be added for the first base station. In thiscase, the initial maximum uplink transmit power that is allocated by theUE to the first base station is the maximum uplink transmit power thatis allocated by the UE to the first base station.

When the first base station knows, according to the semi-persistentscheduling configuration information, that the second base station doesnot schedule uplink data of the UE in a subsequent period of time, forexample, when the first base station receives the SPS deactivationinstruction or the SPS configuration deletion command, the first basestation adds the offset of the uplink power when determining the maximumuplink transmit power of the first base station, that is, uses powercompensation, and allocates a part of the transmit power of the secondbase station to the first base station to increase the maximum uplinktransmit power of the first base station. Specifically, the first basestation recalculates the maximum transmit power P′_(TMAX,eNB1) allocatedby the UE to the first base station. A specific calculation manner isthat: the second base station indicates the offset Δ_(PTMAX) of theuplink transmit power; when the first base station calculates themaximum uplink transmit power P′_(TMAX,eNB1), the first base stationadds the offset Δ_(PTMAX) on a basis of the initial maximum uplinktransmit power P_(TMAX,eNB1) that is allocated by the UE to the firstbase station, namely, P′_(TMAX,eNB1)=P_(TMAX,eNB1)+ΔP_(TMAX).

When the first base station determines, according to the SPS activationinstruction, that the second base station has uplink data to send, thefirst base station does not use power compensation, that is, when thefirst base station determines the maximum uplink transmit power, it isunnecessary to add the offset to the initial maximum uplink transmitpower.

The following describes in detail how the first base station determinesthe offset of the uplink transmit power. The first base stationdetermines the offset of the uplink transmit power when identifying,according to the status of the uplink resource that is scheduled by thesecond base station for the UE, that an uplink resource scheduled by thesecond base station for the UE at a current time point is lower than aset threshold. A value of the offset may also be preconfigured, or theoffset may be dynamically allocated according to the status of theuplink resource of the UE.

It may be known from the foregoing description that the first basestation needs to pre-acquire the initial maximum uplink transmit powerallocated by the UE to the first base station. In this embodiment, theinitial maximum uplink transmit power that is allocated by the UE to thefirst base station is the initial maximum uplink transmit powerdetermined according to a downlink path loss or an uplink path lossbetween each base station and the UE, or the initial maximum uplinktransmit power may also be determined in other manners, for example, aninitial maximum uplink transmit power allocated to each base station isspecified according to an actual processing capability of each basestation, as long as it is ensured that a sum of the initial maximumuplink transmit power allocated to each base station does not exceed themaximum transmit power of the UE.

Step 203: The first base station acquires a power headroom of the UEthat is recalculated according to the maximum uplink transmit power.

This step is an optional step. In this embodiment, only when the maximumuplink transmit power determined by the first base station changescompared with a historical value, or when a variation exceeds a presetthreshold, the first base station acquires the power headroom of the UEthat is recalculated according to the maximum uplink transmit power.Specifically, when the maximum uplink transmit power allocated to thefirst base station changes, a maximum transmit power allocated by the UEto each carrier of the first base station also changes. Correspondingly,the power headroom of the UE also changes. The PH refers to a differencebetween a maximum uplink transmit power P_(CMACX,c) allocated by the UEto each carrier of each base station and an estimated uplink transmitpower of the UE for uplink transmission. A power headroom PH of the UEon carrier C is classified into two types as follows.

A formula for calculating the PH of a first type is:PH=P_(CMAX,c)−P_(PUSCH).

P_(CMAX,c) indicates a maximum uplink transmit power that is allocatedby the UE to carrier C of the first base station, and P_(PUSCH)indicates a transmit power of a physical uplink shared channel (PhysicalUplink Shared Channel, PUSCH for short). In this manner, at the sametime, when data is sent on the PUSCH, control information is not sent ona physical uplink control channel PUCCH.

A formula for calculating the PH of a second type is:PH=P_(CMAX,c)−P_(PUSCH)−P_(PUCCH).

P_(CMAX,c) indicates a maximum uplink transmit power that is allocatedby the UE to carrier C of the first base station, P_(PUSCH) indicates atransmit power allocated to a physical uplink shared channel PUSCH, andP_(PUCCH) indicates information of a transmit power allocated to thePUCCH. In this manner, at the same time, sending of control informationis allowed on the PUCCH when data is sent on the PUSCH.

In this embodiment, because the maximum uplink transmit powerP_(TMAX,eNB1) allocated to the first base station changes, the offsetΔ_(PTMAX) is added on a basis of the initial maximum uplink transmitpower, and the maximum uplink transmit power of each carrier of thefirst base station also changes correspondingly. In this embodiment, thefirst base station has only one carrier, which is used as an example.Therefore, P′_(CMAX,c)=P_(CMAX,c)+Δ_(PTMAX), that is, the offsetΔ_(PTMAX) of the uplink transmit power is added on a basis of themaximum uplink transmit power of carrier C, and therefore,PH′=P′_(CMAX,c)−P_(PUSCH)−P_(PUCCH), or PH′=P′_(CMAX,c)−P_(PUSCH).Certainly, the first base station may also have multiple carriers, andmay properly add a power offset for each carrier, to ensure that a sumof maximum uplink transmit powers of the carriers after the additiondoes not exceed the maximum uplink transmit power allowed by the UE.

By using the foregoing method, a transmit power of a carriercorresponding to the base station may be adjusted according to an actualsituation, so that resources of each carrier can all be used maximally,which improves transmission efficiency of uplink data and a throughputof the UE. It is understandable that the power headroom may also becalculated by the UE and reported to the first base station.

Step 204: The first base station configures an uplink transmit power forthe UE according to the maximum uplink transmit power allocated by theUE to the first base station, a maximum uplink transmit power of eachcarrier, and the power headroom.

The first base station allocates, according to P′_(TMAX,eNB1),P′_(CMAX.,c), and PH′, the uplink transmit power to the UE for use.Specifically, the first base station compares values of P′_(TMAX,eNB1)and P′_(CMAX.,c), and selects a smaller one of the two values toallocate the uplink transmit power to the UE, to ensure that the maximumuplink transmit power allocated to the UE does not exceed the smallerone of the two values.

A main scenario to which this embodiment is applicable is that thesecond base station is responsible for delivering and receiving voiceservice data only, while the first base station is responsible fordelivering and receiving other services. A reason for the considerationis that in the present invention, the second base station is used as amaster base station, and the master base station generally covers a widerange, and can better support continuity of the voice service andimprove user experience.

In the method provided by this embodiment, an uplink transmit power isallocated to each base station in a manner of semi-persistent schedulingbetween base stations; a second base station delivers a semi-persistentscheduling configuration; and when allocating an uplink transmit powerto UE, a first base station determines, according to the semi-persistentscheduling configuration, a maximum uplink transmit power allocated bythe UE to the first base station itself. The first base station canadjust its uplink transmit power properly, which increases a throughputof the UE and utilization of an uplink resource.

FIG. 3 is a flowchart of Embodiment 3 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. In thisembodiment, an initial maximum uplink transmit power is obtained bycalculation according to an uplink path loss and a downlink path loss,and a detailed description about how to calculate, according to theuplink path loss and the downlink path loss, an initial maximum uplinktransmit power allocated by UE to each base station is provided. Themethod provided by this embodiment includes the following steps.

Step 301: A first base station acquires an initial maximum uplinktransmit power that is allocated by UE to the first base station, wherethe initial maximum uplink transmit power is determined according to adownlink path loss or an uplink path loss between each base station andthe UE.

In this embodiment, the first base station is a secondary base station,and a second base station is a master base station. For the UE, in eachaccess process, there is only one master base station, but there may bemultiple secondary base stations. That a first base station acquires aninitial maximum uplink transmit power that is allocated by UE to thefirst base station may be specifically implemented in the followingthree manners.

In a first implementation manner, the first base station receives theinitial maximum uplink transmit power that is allocated by the UE to thefirst base station and reported by the UE, where the initial maximumuplink transmit power is allocated by the UE from a maximum uplinktransmit power of the UE according to a proportion of the downlink pathloss between each base station and the UE.

In a second implementation manner, the first base station receives theinitial maximum uplink transmit power that is allocated by the UE to thefirst base station and sent by the second base station, where theinitial maximum uplink transmit power is allocated by the second basestation from the maximum uplink transmit power of the UE according tothe proportion of the downlink path loss between each base station andthe UE.

In a third implementation manner, the first base station acquires theuplink path loss between each base station and the UE that is sent bythe second base station; the first base station obtains by calculation,from the maximum uplink transmit power of the UE and according to aproportion of the uplink path loss, the initial maximum uplink transmitpower that is allocated by the UE to the first base station. The firstbase station not only needs to acquire the uplink path loss between eachbase station and the UE that is sent by the second base station, butalso needs to calculate an uplink path loss between the first basestation and the UE by itself. Specifically, first, the first basestation receives a sounding reference signal sent by the UE; then, thefirst base station determines the uplink path loss between the firstbase station and the UE according to a receive power and a transmitpower of the sounding reference signal; finally, the first base stationreports the uplink path loss between the first base station and the UEto the second base station, so that the second base station forwards theuplink path loss to other base stations. In this way, each base stationmutually knows the uplink path loss between each base station and theUE, and can allocate a power from the maximum uplink transmit power ofthe UE according to the proportion of the uplink path loss.

Step 302: The first base station allocates an uplink transmit power tothe UE according to the initial maximum uplink transmit power.

In this embodiment, after the first base station acquires the initialmaximum uplink transmit power that is allocated by the UE to the firstbase station, the first base station may further add a supplementaryoffset to the initial maximum uplink transmit power according to anactual requirement or a configuration of the second base station, wherethe supplementary offset may be configured by the second base stationfor the first base station. When a large amount of data needs to betransmitted between the first base station and the UE, but a smallamount of data is transmitted between the UE and the second basestation, the uplink transmit power of the first base station may beincreased, and the maximum uplink transmit power allocated by the UE tothe first base station may be increased. Therefore, a throughput of theUE can be increased, utilization of a whole network is increased, and nointerference is caused to the second base station.

In this embodiment, the first base station may acquire, according to aset period, or when the uplink path loss or downlink path loss changes,or when a path loss variation exceeds a set threshold, the initialmaximum uplink transmit power that is allocated by the UE to the firstbase station.

In the method provided by this embodiment, when a first base stationallocates an uplink transmit power to UE, the first base stationdetermines the uplink transmit power according to an acquired initialmaximum uplink transmit power. Because the initial maximum uplinktransmit power is determined according to an uplink path loss betweeneach base station and the UE, it can be ensured that an initial maximumuplink transmit power allocated to each base station does not exceed anactual requirement of the UE, and that a proper transmit power can beallocated to each base station according to a path loss between eachbase station and the UE, which increases a throughput of the UE andutilization of an uplink resource.

FIG. 4 is a flowchart of Embodiment 4 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. Themethod provided by this embodiment is executed by an apparatus forcontrolling an uplink transmit power in inter-base station carrieraggregation, where the apparatus is integrated in a base station. Themethod provided by this embodiment specifically includes the followingsteps.

Step 401: A second base station provides a status of an uplink resourcethat is scheduled by the second base station for UE, to a first basestation, so that the first base station determines, according to thestatus of the uplink resource that is scheduled by the second basestation for the UE, a maximum uplink transmit power that is allocated bythe UE to the first base station.

Specifically, the second base station may provide the status of theuplink resource to the first base station in the following two manners.

In a first manner, the second base station sends the status of theuplink resource that is scheduled by the second base station for the UE,to the first base station, or sends the status of the uplink resourcethat is scheduled by the second base station for the UE, to the firstbase station through the UE. That the second base station sends thestatus of the uplink resource that is scheduled by the second basestation for the UE, to the first base station through the UE, isspecifically that: the second base station sends the status of theuplink resource that is scheduled by the second base station for the UE,to the UE by using a MAC CE, an RRC message, or uplink controlinformation, so that the UE sends the status of the uplink resource tothe first base station.

In the first manner, the second base station may decide, according to anuplink sending status of the UE, not to schedule, in the second basestation, uplink data of the UE in a period of time, and may deliver arelated indication to the UE, indicating to the UE how long the uplinkdata of the UE is not scheduled, or indicating that uplink controlinformation of the UE, such as a PUCCH, is not scheduled in a period oftime. The second base station determines the status of the uplinkresource that is scheduled by the second base station for the UE, anddelivers the status of the uplink resource to the first base station orthe UE. Specifically, the status of the uplink resource includes anindication that the second base station does not perform uplink datascheduling, a corresponding time, and the like.

In a second manner, when establishing a voice service for the UE, thesecond base station configures semi-persistent scheduling of the uplinkresource for the UE, and sends semi-persistent scheduling configurationinformation to the first base station, or sends semi-persistentscheduling configuration information to the UE, so that the UE sends thesemi-persistent scheduling configuration information to the first basestation. The semi-persistent scheduling configuration informationincludes an SPS configuration command, an SPS configuration deletioncommand, an SPS activation instruction, and an SPS deactivationinstruction.

Step 402: The second base station schedules the uplink resource for theUE according to the status of the uplink resource.

The second base station determines, according to the status of theuplink resource allocated by the second base station to the UE, toschedule the uplink resource for the UE. In a case in which the secondbase station does not perform data scheduling, the maximum uplinktransmit power may be reduced properly, a part of the transmit power isallocated to the first base station, and an uplink transmit power of thefirst base station is increased. The second base station may configurean offset value of an uplink power for the first base station, anddeliver the offset value to the first base station and the UE, so thatthe first base station can adjust the uplink transmit power.

In the method provided by this embodiment, a second base station sends astatus of an uplink resource that is scheduled by the second basestation for UE, to a first base station, so that the first base stationproperly adjusts an uplink transmit power of the first base stationaccording to the status of the uplink resource of the second basestation. Therefore, a throughput of the UE is increased, and utilizationof the uplink resource is increased.

FIG. 5 is a flowchart of Embodiment 5 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. In themethod provided by this embodiment, an uplink transmit power of UE canbe dynamically adjusted. In this embodiment, a first base station is asecondary base station, and a second base station is a master basestation. Specifically, the following steps are included.

Step 501: A second base station configures preset power information,where the preset power information includes at least an uplink transmitpower that is preconfigured by the second base station at a next timepoint for UE.

The second base station preconfigures the preset power informationaccording to a status of data that needs to be scheduled actually at thenext time point. In this embodiment, the preset power information sentby the second base station to a first base station may include: amaximum transmit power of the UE, a maximum transmit power allocated bythe UE to the second base station, an uplink control informationscheduling status of the UE, a maximum transmit power allocated by theUE to each carrier of the second base station, and an offset of anuplink transmit power used by the second base station. The preset powerinformation may further include: whether the UE has uplink controlinformation for scheduling, and whether uplink data and uplink controlinformation are scheduled in parallel.

Step 502: The second base station sends the preset power information toa first base station, so that the first base station determines,according to the preset power information, an uplink transmit power thatis configured by the first base station at the next time point for theUE.

The second base station may send the preset power information to thefirst base station at every transmission time interval TTI, so that thefirst base station can accurately allocate an uplink power to the UEaccording to the preset power information. When the second base stationdoes not perform data scheduling at the next time point, the presetpower information may carry indication information, notifying the firstbase station that no data is scheduled at the next time point.

In this embodiment, in a case in which the preset power information ofthe second base station does not change frequently, to reduce a resourcefor sending the preset power information, the second base station doesnot need to send the preset power information to the first base stationat every TTI, and the preset power information may carry preset powerinformation that is for a period of time.

Step 503: The first base station receives the preset power informationsent by the second base station, where the preset power informationincludes at least the uplink transmit power that is preconfigured by thesecond base station at the next time point for the UE.

When the first base station allocates the uplink transmit power at thenext time point to the UE according to the preset power information sentby the second base station, the transmit power allocated to the firstbase station may be increased properly.

Step 504: The first base station determines, according to the presetpower information, the uplink transmit power that is configured by thefirst base station at the next time point for the UE.

Specifically, according to the preset power information, if the maximumtransmit power allocated by the UE to the second base station is low,the first base station may increase the uplink transmit power allocatedat the next time point to the UE, but it must be ensured that a sum ofmaximum transmit powers allocated to the first base station and thesecond base station does not exceed the maximum transmit power of theUE. If power compensation is considered for the maximum transmit powerallocated by the UE to the second base station, the preset powerinformation further includes the offset of the uplink transmit powerused by the second base station. In addition, according to the maximumtransmit power allocated by the UE to each carrier of the second basestation, a maximum transmit power allocated to each carrier of the firstbase station and a power headroom are adjusted. For a specificcalculation method, reference may be made to the description inEmbodiment 2. After receiving the preset power information that is ofthe second base station and is for the next time point, the first basestation adjusts the uplink transmit power configured by the first basestation at the next time point for the UE. If the uplink transmit powerthat is configured by the second base station at the next time point forthe UE is low, the first base station may properly increase the transmitpower configured by the first base station at the next time point forthe UE, to ensure that a resource of the UE can be used properly. If theuplink transmit power that is configured by the second base station atthe next time point for the UE is high, the first base station mayproperly reduce the transmit power configured by the first base stationat the next time point for the UE.

In the method provided by this embodiment, a first base station canadjust in real time, according to an uplink transmit power that ispreconfigured at a next time point for UE and reported by a second basestation, an uplink transmit power allocated by the first base station atthe next time point to the UE. Therefore, an uplink transmit power ofthe UE can be allocated to each base station more accurately andproperly, and an uplink rate and a throughput of the UE are increased.

FIG. 6 is a flowchart of Embodiment 6 of a method for controlling anuplink transmit power in inter-base station carrier aggregationaccording. The method provided by this embodiment includes the followingsteps.

601. A second base station acquires an initial maximum uplink transmitpower that is allocated by UE to the second base station, where theinitial maximum uplink transmit power is determined according to adownlink path loss or an uplink path loss between each base station andthe UE.

The second base station acquires, specifically by using the followingmethods, the initial maximum uplink transmit power that is allocated bythe UE to the second base station.

In a first method, the second base station receives the initial maximumuplink transmit power that is allocated by the UE to the second basestation and reported by the UE, where the initial maximum uplinktransmit power is allocated by the UE from a maximum uplink transmitpower of the UE according to a proportion of the downlink path lossbetween each base station and the UE.

In a second method, the second base station receives an initial maximumuplink transmit power that is allocated by the UE to each base stationand reported by the UE; or the second base station receives the downlinkpath loss of each base station that is reported by the UE, and obtainsby calculation, from a maximum uplink transmit power of the UE andaccording to a proportion of each downlink path loss, an initial maximumuplink transmit power that is allocated by the UE to each base station;the second base station sends each initial maximum uplink transmit powerto a corresponding base station.

In a third method, the second base station acquires the uplink path lossbetween each base station and the UE that is sent by each base station;the second base station obtains by calculation, from a maximum uplinktransmit power of the UE and according to a proportion of each uplinkpath loss, an initial maximum uplink transmit power that is allocated bythe UE to each base station. The second base station sends each initialmaximum uplink transmit power to a corresponding base station. Thesecond base station further needs to calculate an uplink path lossbetween the second base station and the UE specifically by using thefollowing method: The second base station receives a sounding referencesignal sent by the UE, and determines the uplink path loss between thesecond base station and the UE according to a receive power and atransmit power of the sounding reference signal.

602. The second base station adds a supplementary offset to an initialmaximum uplink transmit power that is allocated to a secondary basestation.

This step is an optional step. The second base station may determine,according to an actual situation, whether it is necessary to add thesupplementary offset to the initial maximum uplink transmit power thatis allocated to the secondary base station. If a supplementary offset ispreconfigured, the second base station adds the supplementary offset tothe initial maximum uplink transmit power that is allocated to the firstbase station. Correspondingly, the second base station reduces a poweroffset allocated to the second base station, where the reduced amount isequal to the supplementary offset allocated to the secondary basestation. If no supplementary offset is preconfigured, it is unnecessaryto add the supplementary offset.

603. The second base station allocates an uplink transmit power to theUE according to the initial maximum uplink transmit power.

For this step, if step 602 is executed, the initial maximum uplinktransmit power in this step is an initial maximum uplink transmit powerobtained after the supplementary offset is added; if step 602 is notexecuted, the initial maximum uplink transmit power in this step refersto an initial maximum uplink transmit power obtained by calculationaccording to a path loss.

In this embodiment, the second base station acquires, according to a setperiod, or when the uplink path loss or downlink path loss changes, orwhen a path loss variation exceeds a set threshold, the initial maximumuplink transmit power that is allocated by the UE to the second basestation.

FIG. 7 is a flowchart of Embodiment 7 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. Themethod provided by this embodiment may be executed by an apparatus forcontrolling an uplink transmit power in inter-base station carrieraggregation, where the apparatus is integrated in UE. The methodprovided by this embodiment includes the following steps.

Step 701: UE acquires a status of an uplink resource that is scheduledby a second base station for the UE.

Specifically, the UE acquires, in the following manner, the status ofthe uplink resource that is scheduled by the second base station for theUE. The UE receives the status that is of the uplink resource and issent by using a MAC CE, an RRC message, or uplink control information bythe second base station; or the UE receives an SPS configurationcommand, an SPS configuration deletion command, an SPS activationinstruction, and an SPS deactivation instruction that are sent by thesecond base station, and uses the commands and instructions as thestatus of the uplink resource. Or, the UE identifies whether the secondbase station does not schedule the uplink resource within a set time,and determines the status of the uplink resource according to anidentification result.

Step 702: The UE reports the status of the uplink resource that isscheduled by the second base station for the UE, to a first basestation, so that the first base station determines, according to thestatus of the uplink resource, a maximum uplink transmit power that isallocated by the UE to the first base station; or the UE determines,according to the status of the uplink resource that is scheduled by thesecond base station for the UE, a maximum uplink transmit power that isallocated by the UE to the first base station, and reports the maximumuplink transmit power to the first base station.

In this embodiment, after the UE acquires the status of the uplinkresource that is scheduled by the second base station for the UE, the UEmay report the status of the uplink resource to the first base station,and the first base station determines the maximum uplink transmit powerthat is allocated by the UE to the first base station. Certainly, the UEmay also determine by itself, according to the status of the uplinkresource, the maximum uplink transmit power that is allocated by the UEto the first base station, and report the maximum uplink transmit powerto the first base station.

The following describes, by using a specific example, how the UEdetermines, according to the status of the uplink resource that isscheduled by the second base station, the maximum uplink transmit powerthat is allocated by the UE to the first base station. First, the UEdetermines an offset of an uplink transmit power according to the statusof the uplink resource that is scheduled by the second base station forthe UE. Then, the UE adds the offset to an initial maximum uplinktransmit power that is allocated by the UE to the first base station,and determines that a sum of the offset and the initial maximum uplinktransmit power is the maximum uplink transmit power allocated by the UEto the first base station, where a value of the offset is preconfiguredor is delivered by the second base station by using network signaling.

In this embodiment, the UE acquires, according to a set period, or whenan uplink path loss or a downlink path loss changes, or when a path lossvariation exceeds a set threshold, an initial maximum uplink transmitpower that is allocated by the UE to each base station.

In the method provided by this embodiment, UE acquires a status of anuplink resource that is scheduled by a second base station for the UE,and reports the status of the uplink resource to a first base station,so that the first base station determines, according to the status ofthe uplink resource that is scheduled by the second base station for theUE, a maximum uplink transmit power; or the UE determines, according tothe status of the uplink resource that is scheduled by the second basestation for the UE, a maximum uplink transmit power allocated to thefirst base station, and reports the maximum uplink transmit power to thefirst base station. Therefore, it is ensured that the maximum uplinktransmit power allocated to the first base station is determinedaccording to a resource between base stations, a maximum uplink transmitpower can be allocated to each base station properly, and a throughputof the UE and utilization of a network are increased.

In the foregoing step 702, that the UE determines, according to thestatus of the uplink resource that is scheduled by the second basestation for the UE, a maximum uplink transmit power that is allocated bythe UE to the first base station, is specifically determining the offsetof the uplink transmit power, and adding the offset on a basis of theinitial maximum uplink transmit power that is allocated by the UE to thefirst base station. The UE may determine the initial maximum uplinktransmit power by using multiple methods. The UE may determine theinitial maximum uplink transmit power according to a downlink path lossor an uplink path loss between each base station and the UE, or may alsodetermine the initial maximum uplink transmit power in other manners,for example, the initial maximum uplink transmit power allocated to eachbase station is specified according to an actual processing capabilityof each base station, as long as it is ensured that a sum of the initialmaximum uplink transmit power allocated to each base station does notexceed a maximum transmit power of the UE.

The following briefly describes how the UE determines the initialmaximum uplink transmit power. In an implementation manner, the UEreports a downlink path loss between the UE and a base station to thebase station, so that the base station determines, according to thedownlink path loss, an initial maximum uplink transmit power that isallocated by the UE to the base station. That the UE reports a downlinkpath loss between the UE and a base station to the base station isspecifically that the UE first measures a downlink path loss between theUE and each base station, and then reports the downlink path lossbetween the UE and each base station to the second base station.

In another implementation manner, the UE determines, according to adownlink path loss between the UE and a base station, an initial maximumuplink transmit power that is allocated by the UE to the base station,and reports the initial maximum uplink transmit power to the basestation. That the UE determines, according to a downlink path lossbetween the UE and a base station, an initial maximum uplink transmitpower that is allocated by the UE to the base station, and reports theinitial maximum uplink transmit power to the base station isspecifically that: the UE first measures a downlink path loss betweenthe UE and each base station, obtains by calculation, from the maximumuplink transmit power of the UE and according to a proportion of thedownlink path loss between the UE and each base station, an initialmaximum uplink transmit power allocated to each base station, andfinally reports the determined initial maximum uplink transmit power toeach base station, or reports the determined initial maximum uplinktransmit power to the second base station, so that the second basestation forwards the determined initial maximum uplink transmit power toeach base station.

In the foregoing two manners, that the UE measures a downlink path lossbetween the UE and each base station is specifically that: the UEreceives a sounding reference signal sent by each base station, anddetermines a downlink path loss between the UE and each base stationaccording to a receive power and a transmit power of the soundingreference signal.

In this embodiment, to allocate the initial maximum uplink transmitpower to each base station more properly and increase the throughput ofthe UE, after the UE determines the initial maximum uplink transmitpower allocated to each base station, the UE further adds asupplementary offset to the maximum uplink transmit power allocated tothe first base station, and correspondingly reduces an initial maximumuplink transmit power allocated to the second base station.

In this embodiment, the UE acquires, according to a set period, or whenan uplink path loss or a downlink path loss changes, or when a path lossvariation exceeds a set threshold, the initial maximum uplink transmitpower that is allocated by the UE to each base station.

FIG. 8 is a flowchart of Embodiment 8 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. Thisembodiment describes in detail how to determine, according to a downlinkpass loss, an initial maximum uplink transmit power allocated to eachbase station. In this embodiment, a first base station is a secondarybase station, and a second base station is a master base station.Specifically, the following steps are included.

Step 801: UE measures a downlink path loss between the UE and each basestation.

The UE may measure a downlink receive power of a sounding referencesignal, and obtain a downlink path loss by calculating a differencebetween a transmit power and a receive power of the sounding referencesignal (SRS for short), where the sounding reference signal may be acell reference signal CRS (Cell Reference Signal). Each base stationsends a reference signal to the UE, where information sent to the UEcarries a transmit power of the reference signal. After receiving thereference signal sent by each base station, the UE measures a receivepower of each reference signal, and obtains a downlink path loss betweenthe UE and each base station by subtracting the corresponding receivepower from the transmit power of each reference signal.

In the following description, an example in which there are one masterbase station and one secondary base station for UE is used, where afirst base station is the secondary base station, and a second basestation is the master base station. It is assumed that a downlink pathloss between the UE and the first base station is PL_(eNB1), and that adownlink path loss between the UE and the second base station isPL_(eNB2).

Step 802: The UE obtains by calculation, from a maximum uplink transmitpower of the UE and according to a proportion of the downlink path lossbetween the UE and each base station, an initial maximum uplink transmitpower allocated to each base station.

It is assumed that the maximum transmit power of the UE is P_(TMAX), anda proportion of a path loss of the UE served by the first base stationis α=PL_(eNB1)/(PL_(eNB1)+PL_(eNB2)). Therefore, an initial maximumuplink transmit power that is allocated by the UE to the first basestation is P_(TMAX,eNB1)=α*P_(TMAX), and an initial maximum uplinktransmit power that is allocated by the UE to the second base station isP_(TMAX,eNB2)=(1−α)*P_(TMAX).

In this embodiment, the initial maximum uplink transmit power may be avalue directly obtained by calculation according to the downlink pathloss, or may be a modified initial maximum uplink transmit powerobtained by adding a supplementary offset to the initial maximum uplinktransmit power. Optionally, because the first base station is generallya small-sized base station, a supplementary offset may be added for theUE, so that the UE increases a transmit power in the first base station.By increasing the transmit power in the first base station, a throughputof the UE may be increased, and no interference is caused to the secondbase station. For example, if the supplementary offset is α=x dBm, theinitial maximum uplink transmit power allocated to the second basestation is P_(TMAX,eNB2)=α*P_(TMAX)−β, and the initial maximum uplinktransmit power allocated to the first base station isP_(TMAX,eNB1)=(1−α)*P_(TMAX)+β. In addition, the supplementary offsetmay also be expressed in other forms, for example, in a form of aproportion, 10% of a power of the second base station is used as asupplementary offset and configured for the first base station. Thesupplementary offset is configured by the second base station for theUE, for example, the supplementary offset is carried in a radio resourcecontrol connection reconfiguration message sent to the UE.

Step 803: The UE reports the determined initial maximum uplink transmitpower to each base station, or reports the determined initial maximumuplink transmit power to a second base station, so that the second basestation forwards the determined initial maximum uplink transmit power toeach base station.

The UE reports initial maximum uplink transmit powers that are allocatedto the first base station and the second base station and obtained bycalculation, to the first base station and the second base station, sothat the initial maximum uplink transmit powers are used by the firstbase station and the second base station for allocating an uplinktransmit power. The UE may also report the initial maximum uplinktransmit power of each base station to the second base station, and thesecond base station reports, by using interface information between thesecond base station and the first base station, the initial maximumuplink transmit power allocated to each base station, to each secondbase station.

Specifically, the UE may report the initial maximum uplink transmitpower to the base station by using a dedicated radio resource controlconnection message, or may also use a MAC CE for reporting. For example,a new MAC CE may be defined, as shown in Table 1:

TABLE 1 C₇ C₆ C₅ C₄ C₃ C₂ C₁ R P V PH (Type2, PCell) R R P_(CMAX, c) 1 PV PH (Type1, PCell) R R P_(CMAX, c) 2 P V PH (Type1, SCell 1) R RP_(CMAX, c) 3 . . . P V P_(TMAX (eNBn)) R R P_(TMAX, eNBn)

In this embodiment, the UE acquires, according to a set period, or whena downlink path loss changes, or when a path loss variation exceeds aset threshold, the initial maximum uplink transmit power that isallocated by the UE to each base station.

In the method provided by this embodiment, UE calculates a downlink pathloss between the UE and each base station, allocates an initial maximumuplink transmit power to each base station from a maximum uplinktransmit power of the UE according to a proportion of the downlink pathloss, and sends the calculated maximum uplink transmit power that isallocated by the UE to each base station, to each base station, so thateach base station allocates an uplink transmit power to the UE andschedules a resource according to the initial maximum uplink transmitpower. In the method provided by this embodiment, when allocating apower to each base station, the UE comprehensively considers thedownlink path loss of each base station, and can coordinate powersbetween base stations well, which increases a throughput of the UE andutilization of an uplink resource.

FIG. 9 is a flowchart of Embodiment 9 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. Asshown in the FIG. 9, the following steps are included.

Step 901: UE measures a downlink path loss between the UE and each basestation.

In this embodiment, the UE also receives a reference signal sent by eachbase station, such as a cell reference signal (CRS), and determines thedownlink path loss between the UE and each base station according to areceive power and a transmit power of the reference signal. For aspecific calculation method, reference may be made to the implementationmanner of Embodiment 8, and no further description is provided herein.

Step 902: The UE reports the downlink path loss between the UE and eachbase station to a second base station.

In this embodiment, the second base station is a master base station,that is, the UE reports the calculated downlink path loss to the masterbase station. The UE may use a dedicated radio resource control message,for example, define a new RRC downlink path loss reporting message.After receiving a configuration message of a first base station, the UEtriggers measuring and reporting of the downlink path loss between theUE and each base station, or when the second base station configures thefirst base station for the UE, the second base station triggers adownlink path loss reporting request message to the UE, and the UEmeasures and reports the downlink path loss according to the requestmessage.

Because the UE moves, the measured downlink path loss changes. When thedownlink path loss changes, a changed path loss value should be reportedagain. The second base station acquires updated path loss information,and recalculates an initial maximum uplink transmit power allocated toeach base station. Triggering conditions for the UE may be as follows.

Periodic triggering: A network side delivers a configured period to theUE, and the UE periodically calculates and reports the downlink pathloss of each base station according to the configuration of the networkside.

Event triggering: For example, the network side configures a thresholdof a change of a downlink path loss or maximum transmit power; when theUE detects that a variation of the downlink path loss exceeds thethreshold, the UE is triggered to report the downlink path loss of eachbase station. For another example, the network side configures athreshold of a difference between downlink path losses of base stations;when a change of a difference between path losses of the first basestation and the second base station exceeds the threshold, the UE istriggered to report the downlink path loss of each base station. Foranother example, the network side configures a threshold of a ratiobetween downlink path losses of base stations; when a change of a ratiobetween path losses of the first base station and the second basestation exceeds the threshold, the UE is triggered to report thedownlink path loss of each base station.

The network side may also periodically deliver a downlink path lossrequest message, and the UE reports the downlink path loss of each basestation according to the request of the network side.

Step 903: The second base station receives the downlink path loss ofeach base station that is reported by the UE, and obtains bycalculation, from a maximum uplink transmit power of the UE andaccording to a proportion of each downlink path loss, an initial maximumuplink transmit power that is allocated by the UE to each base station.

In this embodiment, the second base station further needs to acquire themaximum uplink transmit power of the UE. Specifically, the second basestation may determine the maximum transmit power of the UE according toa type of the UE included in capability information of the UE. After theUE initially accesses a network, the UE reports the capabilityinformation of the UE to the second base station, where the capabilityinformation of the UE includes information such as the type of the UEand a frequency supported by the UE. For different types of UEs,supported transmit capacities and powers are different. Therefore, themaximum uplink transmit power of the UE can be determined according tothe type of the UE.

After the maximum uplink transmit power of the UE is determined, thesecond base station performs allocation from the maximum uplink transmitpower of the UE according to the proportion of the downlink path lossbetween each base station and the UE. For a specific method, referencemay be made to the method for calculating the initial maximum uplinktransmit power by the UE in Embodiment 8, and no further description isprovided herein.

Step 904: The second base station sends each initial maximum uplinktransmit power to a corresponding base station.

In this step, the second base station delivers the allocated initialmaximum uplink transmit power of each second base station to acorresponding base station. The second base station may deliver theallocated initial maximum uplink transmit power to the first basestation by using an interface message between the second base stationand the first base station, such as an X2 interface message. The firstbase station receives the initial maximum uplink transmit power that isallocated by the UE to the first base station and sent by the secondbase station, and the first base station performs resource allocationand scheduling for the UE according to the initial maximum uplinktransmit power allocated by the UE.

In this embodiment, the UE reports the downlink path loss of each basestation to the second base station, and the second base station obtainsby calculation, from the maximum uplink transmit power of the UE andaccording to the proportion of each downlink path loss, the initialmaximum uplink transmit power that is allocated by the UE to the firstbase station. It is understandable that the UE may also report thedownlink path loss of each base station to the first base station; thefirst base station receives the downlink path loss of each base stationthat is reported by the UE, and obtains by calculation, from the maximumuplink transmit power of the UE and according to the proportion of eachdownlink path loss, the initial maximum uplink transmit power that isallocated by the UE to the first base station. The first base station isa secondary base station. Each secondary base station calculates aninitial maximum uplink transmit power allocated to it, and reports itsinitial maximum uplink transmit power to the master base station.

In the method provided by this embodiment, UE calculates a downlink pathloss between the UE and each base station, and reports the downlink pathloss to a second base station; the second base station allocates aninitial maximum uplink transmit power to each base station according toa proportion of the downlink path loss, and sends the initial maximumuplink transmit power to a corresponding base station. In the methodprovided by this embodiment, when allocating a power to each basestation, the second base station comprehensively considers the downlinkpath loss of each base station, and coordinates powers between basestations according to an actual capability of each base station, whichincreases a throughput of the UE and utilization of an uplink resource.

FIG. 10 is a flowchart of Embodiment 10 of a method for controlling anuplink transmit power in inter-base station carrier aggregation. Thefollowing steps are included.

Step 1001: Each base station measures an uplink path loss between eachbase station and UE.

Each base station measures a receive power of an uplink reference signalsent by the UE, such as a sounding reference signal, where a differencebetween the receive power and a transmit power of the uplink referencesignal is an uplink path loss. Specifically, a first base stationreceives a sounding reference signal sent by the UE, and the first basestation determines an uplink path loss between the first base stationand the UE according to a receive power and a transmit power of thesounding reference signal. A second base station uses the same method tocalculate an uplink path loss.

Step 1002: A first base station reports an uplink path loss between thefirst base station and the UE to a second base station.

In this embodiment, each base station calculates an uplink path lossbetween each base station and the UE by itself, and the first basestation reports the uplink path loss between the first base station andthe UE to the second base station, so that the second base stationdetermines an initial maximum uplink transmit power according to theuplink path loss between each base station and the UE. The first basestation may report the uplink path loss by using an X2 interface messagebetween the first base station and the second base station, where theinterface message may be a newly defined dedicated message. The firstbase station may report the uplink path loss when requested by thesecond base station or after the uplink path loss changes, orperiodically report the uplink path loss according to a configuration ofa network side.

Step 1003: The second base station receives the uplink path loss betweeneach base station and the UE that is sent by each base station, andobtains by calculation, from a maximum uplink transmit power of the UEand according to a proportion of each uplink path loss, an initialmaximum uplink transmit power that is allocated by the UE to each basestation.

The following describes, by using a specific example, how the secondbase station calculates, according to the proportion of each uplink pathloss, the initial maximum uplink transmit power allocated to each basestation. In this embodiment, an example in which there are only onemaster base station and one secondary base station for the UE is used.It is assumed that: a maximum transmit power of the UE is P_(TMAX), theuplink path loss between the UE and the first base station is PL_(eNB1),the uplink path loss between the UE and an SeNB is P_(TMAX,eNB2), aninitial maximum uplink transmit power of the UE served by the SeNB isP_(TMAX,eNB2), and an initial maximum uplink transmit power of the UEserved by a PeNB is P_(TMAX,eNB1). The PeNB may calculate, according toa proportion value of each uplink path loss, the initial maximum uplinktransmit power allocated to each base station, where a is a proportionof the uplink path loss, and α=PL_(eNB1)/(PL_(eNB1)+PL_(eNB2)).Therefore, a maximum transmit power of the UE served by the PeNB isP_(TMAX,eNB1)=α*P_(TMAX), and a maximum transmit power of the UE servedby the secondary eNB is P_(TMAX,eNB2)=(1−α)*P_(TMAX).

In this embodiment, the second base station also needs to pre-acquirethe maximum uplink transmit power of the UE. For a specific manner,reference may be made to the description in Embodiment 9.

Optionally, in this step, after the second base station determines theinitial maximum uplink transmit power of each base station according tothe uplink path loss, the second base station may configure asupplementary offset for the first base station, so that the UEincreases a transmit power in the first base station. By increasing thetransmit power in the first base station, a throughput of the UE isincreased, and no interference is caused to the second base station. Forexample, if the supplementary offset is β=x dBm, the initial maximumuplink transmit power of the second base station isP_(TMAX,eNB2)=α*P_(TMAX)−β, and the initial maximum uplink transmitpower of the first base station is P_(TMAX,eNB1)=(1−α)*P_(TMAX)+β. Inaddition, the supplementary offset may also be expressed in other forms,for example, in a form of a proportion, which is not limited in thisembodiment.

Step 1004: The second base station sends each initial maximum uplinktransmit power to a corresponding base station.

The second base station sends each initial maximum uplink transmit powerto the corresponding base station by using an interface between thesecond base station and the first base station, so that the first basestation adjusts an uplink transmit power of the first base stationaccording to the initial maximum uplink transmit power.

In the method provided by this embodiment, each base station calculatesan uplink path loss between each base station and UE, and a first basestation reports the uplink path loss to a second base station; thesecond base station allocates an initial maximum uplink transmit powerto each base station according to a proportion of the uplink path loss,and sends the initial maximum uplink transmit power to each basestation. In the method provided by this embodiment, when allocating apower to each base station, the second base station comprehensivelyconsiders a downlink path loss of each base station, and coordinatespowers between base stations according to an actual capability of eachbase station, which increases a throughput of the UE and utilization ofan uplink resource.

FIG. 11 is a flowchart of Embodiment 11 of a method for controlling anuplink transmit power in inter-base station carrier aggregation.Specifically, the following steps are included. In the method providedby this embodiment, UE determines an uplink transmit power according towhether a master base station performs uplink data scheduling.Specifically, the following steps are included:

Step 1101: A second base station sends a status of an uplink resource toUE.

In this embodiment, the second base station may decide, according to anuplink sending status of the UE, not to schedule uplink data of the UEin the second base station in a period of time, and may deliver arelated indication to the UE, indicating to the UE how long the uplinkdata of the UE is not scheduled, or indicating that uplink controlinformation of the UE, such as a PUCCH, is not scheduled in a period oftime. Therefore, the second base station determines the status of theuplink resource that is scheduled by the second base station for the UE,and delivers the status of the uplink resource to a first base stationor the UE. Specifically, the status of the uplink resource includes anindication that the second base station does not perform uplink datascheduling, a corresponding time, and the like.

Specifically, the second base station sends the status of the uplinkresource by using a MAC CE, an RRC message, or uplink controlinformation.

Step 1102: The second base station determines, according to the statusof the uplink resource of the UE, a maximum uplink transmit powerallocated by the UE to each base station and a power headroom.

Specifically, the UE determines an offset of an uplink transmit poweraccording to the status of the uplink resource that is scheduled by thesecond base station for the UE; when the second base station doesperform data scheduling in a period of time, the UE adds the offset toan initial maximum uplink transmit power that is allocated by the UE tothe first base station, and determines that a sum of the offset and theinitial maximum uplink transmit power is a maximum uplink transmit powerallocated by the UE to the first base station. For example, if theoffset of the uplink transmit power that is determined by the UE isΔ_(PTMAX), and the initial maximum uplink transmit power that isallocated by the UE to the first base station is P_(TMAX,eNB1), themaximum uplink transmit power P′_(TMAX,eNB1) that is allocated by the UEto the first base station is P′_(TMAX,eNB1)=P_(TMAX,eNB1)+Δ_(PTMAX). Inthis embodiment, the power headroom may be configured by a network sidefor the UE, or may also be carried in the status that is of the uplinkresource and is sent by the second base station to the UE.

After the maximum uplink transmit power that is allocated by the UE tothe first base station changes, a maximum uplink transmit power that isallocated by the UE to each carrier of the first base station alsochanges. It is assumed that: a maximum uplink transmit power that isallocated by the UE at a previous time point to each carrier of thefirst base station is P_(CMAX,c), and a recalculated maximum uplinktransmit power P′_(CMAX,c) that is allocated by the UE to a carrier ofthe first base station is P′_(CMAX,c)=P_(CMAX,c)+Δ_(PTMAX), whereΔ_(PTMAX) is an offset of an uplink transmit power. A power headroom ofthe first base station is PH′=P′_(CMAX,c)−P_(PUSCH)−P_(PUCCH), orPH′=P′_(CMAX,c)−P_(PUSCH).

Step 1103: The UE reports, to a first base station, a maximum uplinktransmit power that is allocated to the first base station and isobtained by calculation, and a maximum uplink transmit power and a powerheadroom of each carrier.

The UE reports the updated P′_(TMAX,eNB1) that is allocated to the firstbase station, P′_(CMAX,c), and PH′ together to the first base station,so that the first base station uses them to schedule and allocate anuplink power of the UE.

In the method provided by this embodiment, UE calculates a downlink pathloss between the UE and each base station, and reports the downlink pathloss to a second base station; the second base station allocates aninitial maximum uplink transmit power to each base station according toa proportion of the downlink path loss, and sends the initial maximumuplink transmit power to a corresponding base station. In the methodprovided by this embodiment, when allocating a power to each basestation, the second base station comprehensively considers the downlinkpath loss of each base station, and coordinates powers between basestations according to an actual capability of each base station, whichincreases a throughput of the UE and utilization of an uplink resource.

FIG. 12 is a schematic structural diagram of Embodiment 1 of a firstbase station. As shown in FIG. 12, the first base station provided bythis embodiment includes a power acquiring module 11 and a powerdetermining module 12.

The power acquiring module 11 is configured to acquire a maximum uplinktransmit power that is allocated by user equipment UE to the first basestation, where the maximum uplink transmit power is determined accordingto a status of an uplink resource that is scheduled by a second basestation for the UE.

The first base station receives, from the second base station or the UE,the status of the uplink resource that is scheduled by the second basestation for the UE, and the first base station determines, according tothe status of the uplink resource that is scheduled by the second basestation for the UE, the maximum uplink transmit power that is allocatedby the UE to the first base station. Alternatively, the first basestation receives, from the second base station or the UE, the maximumuplink transmit power that is allocated by the UE to the first basestation, where the maximum uplink transmit power is determined by thesecond base station or the UE according to the status of the uplinkresource that is scheduled by the second base station for the UE.

The status of the uplink resource may be semi-persistent schedulingconfiguration information of the uplink resource that is scheduled forthe UE when the second base station establishes a voice service for theUE. The semi-persistent scheduling configuration information may includean SPS configuration command, an SPS configuration deletion command, anSPS activation instruction, and an SPS deactivation instruction. Statusinformation of the uplink resource may also be the status that is of theuplink resource and is sent by the second base station by using a MACCE, an RRC message, or uplink control information.

The power determining module 12 is configured to configure an uplinktransmit power for the UE according to the maximum uplink transmitpower.

After the power acquiring module 11 acquires the maximum uplink transmitpower allocated by the UE, the power determining module 12 configuresthe uplink transmit power for the UE properly according to the maximumuplink transmit power allocated by the UE, and controls the uplinktransmit power allocated to the UE not to exceed a maximum uplinktransmit power of the UE, or properly reduces a transmit power of theUE.

The first base station provided by this embodiment may be configured toexecute the technical solution provided by method Embodiment 1. Thespecific implementation manner and technical effect are similar, and arenot further described herein.

When the first base station provided by this embodiment allocates atransmit power to UE, the first base station performs allocationaccording to a maximum transmit power that is allocated by the UE to thefirst base station. Because the maximum transmit power allocated to thefirst base station is allocated according to status information of anuplink resource of a second base station, a power that is allocated bythe UE to each base station can be coordinated. Therefore, the firstbase station can accurately allocate an uplink transmit power to the UE,and a throughput of the UE is increased while requirements of multiplebase stations for transmit powers are satisfied.

FIG. 13 is a schematic structural diagram of Embodiment 2 of a firstbase station. In this embodiment, a first base station is a secondarybase station, and a second base station is a master base station. Asshown in FIG. 13, the first base station provided by this embodimentincludes: a power acquiring module 21, configured to acquire a maximumuplink transmit power that is allocated by user equipment UE to thefirst base station, where the maximum uplink transmit power isdetermined according to a status of an uplink resource that is scheduledby a second base station for the UE; and a power determining module 22,configured to configure an uplink transmit power for the UE according tothe maximum uplink transmit power.

In this embodiment, the power acquiring module 21 includes an uplinkresource status receiving unit 211 and an uplink transmit powerdetermining unit 212.

The uplink resource status receiving unit 211 is configured to receive,from the second base station or the UE, the status of the uplinkresource that is scheduled by the second base station for the UE. Thestatus of the uplink resource is semi-persistent schedulingconfiguration information of the uplink resource that is scheduled forthe UE when the second base station establishes a voice service for theUE. The semi-persistent scheduling configuration information includes anSPS configuration command, an SPS configuration deletion command, an SPSactivation instruction, and an SPS deactivation instruction.

The uplink transmit power determining unit 212 is configured todetermine, according to the status that is of the uplink resourcescheduled by the second base station for the UE and is received by theuplink resource status receiving unit 211, the maximum uplink transmitpower that is allocated by the UE to the first base station.

In this embodiment, the power determining module 22 includes a poweroffset determining unit 221 and a power determining unit 222. The poweroffset determining unit 221 is configured to determine an offset of anuplink transmit power according to the status of the uplink resourcethat is scheduled by the second base station for the UE. The poweroffset determining unit 221 is specifically configured to: determine theoffset of the uplink transmit power when identifying, according to thestatus of the uplink resource that is scheduled by the second basestation for the UE, that an uplink resource scheduled by the second basestation for the UE at a current time point is lower than a setthreshold, where a value of the offset is preconfigured. The powerdetermining unit 222 is configured to add the offset to an initialmaximum uplink transmit power that is allocated by the UE to the firstbase station, and determine that a sum of the offset and the initialmaximum uplink transmit power is the maximum uplink transmit powerallocated by the UE to the first base station. According to the statusof the uplink resource of the second base station, when the second basestation does not send data or sends a small amount of data, a part orall of a transmit power (namely, a power offset) of the second basestation may be allocated to the first base station, to increase atransmit power of the first base station.

The first base station provided by this embodiment further includes apower headroom determining module 23, configured to: when the uplinktransmit power determined by the power determining module 22 changescompared with a historical value, or when a variation exceeds a presetthreshold, acquire a power headroom of the UE that is recalculatedaccording to the maximum uplink transmit power.

In a feasible implementation manner, the first base station provided bythis embodiment further includes a preset power receiving module and apreset power configuring module.

The preset power receiving module is configured to receive preset powerinformation sent by the second base station, where the preset powerinformation includes at least an uplink transmit power that ispreconfigured by the second base station at a next time point for theUE, where the preset power information includes: a maximum transmitpower of the UE, a maximum transmit power allocated by the UE to thesecond base station, an uplink control information scheduling status ofthe UE, a maximum transmit power allocated by the UE to each carrier ofthe second base station, and an offset of an uplink transmit power usedby the second base station.

The preset power configuring module is configured to determine,according to the preset power information, an uplink transmit power thatis configured by the first base station at the next time point for theUE. Specifically, when the preset power configuring module allocates theuplink transmit power at the next time point to the UE according to thepreset power information that is sent by the second base station andreceived by the preset power receiving module and an uplink transmitpower that is allocated at a previous time point to the first basestation and determined by the power determining module 22, the presetpower configuring module may properly increase or decrease the transmitpower allocated to the first base station. By using this method, theuplink transmit power that is allocated by the first base station at thenext time point to the UE may be adjusted in real time; therefore, theUE can allocate an uplink transmit power to each base station moreaccurately and properly, and an uplink rate and a throughput of the UEare increased.

The technical solution provided by this embodiment may be configured toexecute the technical solutions provided by method Embodiment 1,Embodiment 2, Embodiment 5, and Embodiment 11. The specificimplementation manner and technical effect are similar, and are notfurther described herein.

FIG. 14 is a schematic structural diagram of Embodiment 3 of a firstbase station. In this embodiment, a first base station is a secondarybase station, and a second base station is a master base station. Asshown in FIG. 14, on a basis of the base station shown in FIG. 12 andFIG. 13, the first base station provided by this embodiment specificallyincludes an initial maximum uplink transmit power acquiring module 31and a power allocating module 32.

The initial maximum uplink transmit power acquiring module 31 isconfigured to acquire an initial maximum uplink transmit power that isallocated by UE to the first base station, where the initial maximumuplink transmit power is determined according to a downlink path loss oran uplink path loss between each base station and the UE.

The power allocating module 32 is configured to allocate an uplinktransmit power to the UE according to the initial maximum uplinktransmit power.

The initial maximum uplink transmit power acquiring module 31 mayacquire, in the following manner, the initial maximum uplink transmitpower that is allocated by the UE to the first base station.

Specifically, the initial maximum uplink transmit power acquiring module31 is configured to: receive the initial maximum uplink transmit powerthat is allocated by the UE to the first base station and reported bythe UE, where the initial maximum uplink transmit power is allocated bythe UE from a maximum uplink transmit power of the UE according to aproportion of the downlink path loss between each base station and theUE.

The initial maximum uplink transmit power acquiring module 31 is furtherconfigured to: receive the initial maximum uplink transmit power that isallocated by the UE to the first base station and sent by the secondbase station, where the initial maximum uplink transmit power isallocated by the second base station from the maximum uplink transmitpower of the UE according to the proportion of the downlink path lossbetween each base station and the UE.

The initial maximum uplink transmit power acquiring module 31 isspecifically configured to: receive the downlink path loss of each basestation that is reported by the UE, and obtain by calculation, from themaximum uplink transmit power of the UE and according to the proportionof each downlink path loss, the initial maximum uplink transmit powerthat is allocated by the UE to the first base station.

The initial maximum uplink transmit power acquiring module 31 isspecifically configured to: acquire the uplink path loss between eachbase station and the UE that is sent by the second base station, andobtain by calculation, from the maximum uplink transmit power of the UEand according to a proportion of each uplink path loss, the initialmaximum uplink transmit power that is allocated by the UE to the firstbase station.

The initial maximum uplink transmit power acquiring module 31 is furtherconfigured to: add a supplementary offset to the initial maximum uplinktransmit power after acquiring the initial maximum uplink transmit powerthat is allocated by the UE to the first base station. The supplementaryoffset may be configured by the second base station for the first basestation. When a large amount of data needs to be transmitted between thefirst base station and the UE, but a small amount of data is transmittedbetween the UE and the second base station, the uplink transmit power ofthe first base station may be increased, and the maximum uplink transmitpower allocated by the UE to the first base station may be increased.Therefore, a throughput of the UE can be increased, utilization of awhole network is increased, and no interference is caused to the secondbase station.

In this embodiment, the initial maximum uplink transmit power acquiringmodule 31 is specifically configured to: acquire, when the UE initiallyaccesses the first base station, or according to a set period, or whenthe uplink path loss or downlink path loss changes, or when a path lossvariation exceeds a set threshold, the initial maximum uplink transmitpower that is allocated by the UE to the first base station. After theinitial maximum uplink transmit power that is allocated by the UE to thefirst base station is acquired, the power allocating module 32 allocatesthe uplink transmit power to the UE according to the initial maximumuplink transmit power. Then, a power acquiring module 33 is configuredto acquire the maximum uplink transmit power that is allocated by the UEto the first base station, where the maximum uplink transmit power thatis allocated by the UE to the first base station is determined accordingto a maximum uplink transmit power that is allocated by the powerallocating module 32 to the first base station and a status of an uplinkresource that is scheduled by the second base station for the UE; and apower determining module 34 is configured to configure the uplinktransmit power for the UE according to the maximum uplink transmitpower.

The first base station provided by this embodiment may further include areference signal receiving module, an uplink path loss determiningmodule, and a path loss reporting module. The reference signal receivingmodule is configured to receive a sounding reference signal sent by theUE. The uplink path loss determining module is configured to determinean uplink path loss between the first base station and the UE accordingto a receive power and a transmit power of the sounding referencesignal. The path loss reporting module is configured to report theuplink path loss between the first base station and the UE to the secondbase station, so that the second base station forwards the uplink pathloss to other base stations. Therefore, the first base station and theother base stations can determine, according to the uplink path lossbetween the first base station and the UE, the initial maximum uplinktransmit power allocated to the first base station.

The first base station provided by this embodiment is configured toexecute the flowchart of method Embodiment 3. The specificimplementation manner and technical effect are similar, and thereforeare not further described herein.

FIG. 15 is a schematic structural diagram of Embodiment 4 of a secondbase station according to the present invention. As shown in FIG. 15,the second base station provided by this embodiment includes an uplinkresource status providing module 41 and an uplink resource schedulingmodule 42.

The uplink resource status providing module 41 is configured to provide,for a first base station, a status of an uplink resource that isscheduled by the second base station for UE, so that the first basestation determines, according to the status of the uplink resource thatis scheduled by the second base station for the UE, a maximum uplinktransmit power that is allocated by the UE to the first base station.

The uplink resource status providing module 41 provides the status ofthe uplink resource for the first base station specifically in thefollowing manner.

The uplink resource status providing module 41 sends the status of theuplink resource that is scheduled by the second base station for the UE,to the first base station, or sends the status of the uplink resourcethat is scheduled by the second base station for the UE, to the firstbase station through the UE. The uplink resource status providing module41 may further send the status of the uplink resource that is scheduledby the second base station for the UE, to the UE by using a MAC CE, anRRC message, or uplink control information, so that the UE sends thestatus of the uplink resource to the first base station.

The uplink resource status providing module 41 is specificallyconfigured to: when establishing a voice service for the UE, configuresemi-persistent scheduling of the uplink resource for the UE, and sendsemi-persistent scheduling configuration information to the first basestation, or send semi-persistent scheduling configuration information tothe UE, so that the UE sends the semi-persistent schedulingconfiguration information to the first base station. The semi-persistentscheduling configuration information includes an SPS configurationcommand, an SPS configuration deletion command, an SPS activationinstruction, and an SPS deactivation instruction.

The uplink resource scheduling module 42 is configured to schedule theuplink resource for the UE according to the status of the uplinkresource.

In a possible implementation manner, in this embodiment, the first basestation is a secondary base station, and the second base station is amaster base station. On a basis of the foregoing embodiment, thisembodiment further includes a preset power configuring module and apreset power information sending module.

The preset power configuring module is configured to configure presetpower information, where the preset power information includes at leastan uplink transmit power that is preconfigured by the second basestation at a next time point for the UE. The preset power informationincludes: a maximum transmit power of the UE, a maximum transmit powerallocated by the UE to the second base station, an uplink controlinformation scheduling status of the UE, a maximum transmit powerallocated by the UE to each carrier of the second base station, and anoffset of an uplink transmit power used by the second base station.

The preset power information sending module is configured to send thepreset power information to the first base station, so that the firstbase station determines, according to the preset power information, anuplink transmit power that is configured by the first base station atthe next time point for the UE.

The second base station provided by this embodiment may be configured toexecute the solutions provided by method Embodiment 4 and Embodiment 5.The specific implementation manner and technical effect are similar, andare not further described herein.

FIG. 16 is a schematic structural diagram of Embodiment 5 of a secondbase station. As shown in FIG. 16, the second base station provided bythis embodiment includes an initial maximum uplink transmit poweracquiring module 51, configured to acquire an initial maximum uplinktransmit power that is allocated by UE to the second base station, wherethe initial maximum uplink transmit power is determined according to adownlink path loss or an uplink path loss between each base station andthe UE; and a power allocating module 52, configured to allocate anuplink transmit power to the UE according to the initial maximum uplinktransmit power.

Specifically, the initial maximum uplink transmit power acquiring module51 acquires, in the following manners, the initial maximum uplinktransmit power allocated to the second base station.

In a first implementation manner, the initial maximum uplink transmitpower acquiring module 51 receives the initial maximum uplink transmitpower that is allocated by the UE to the second base station andreported by the UE, where the initial maximum uplink transmit power isallocated by the UE from a maximum uplink transmit power of the UEaccording to a proportion of the downlink path loss between each basestation and the UE. In this implementation manner, the initial maximumuplink transmit power is calculated by the UE and reported to the secondbase station.

In a second implementation manner, the initial maximum uplink transmitpower acquiring module 51 receives an initial maximum uplink transmitpower that is allocated by the UE to each base station and reported bythe UE; or receives the downlink path loss of each base station that isreported by the UE, and obtains by calculation, from the maximum uplinktransmit power of the UE and according to the proportion of eachdownlink path loss, the initial maximum uplink transmit power that isallocated by the UE to each base station. In this implementation manner,the initial maximum uplink transmit power is obtained by the second basestation by calculation according to the downlink path loss reported bythe UE.

The second base station in this embodiment further includes an initialmaximum uplink transmit power sending module 53, configured to send eachinitial maximum uplink transmit power to a corresponding base station.

When the initial maximum uplink transmit power that is allocated by theUE to each base station is calculated by the second base station, theinitial maximum uplink transmit power acquiring module 51 furtherincludes an uplink path loss acquiring unit 511 and an initial maximumuplink transmit power allocating unit 512.

The uplink path loss acquiring unit 511 is configured to acquire theuplink path loss between each base station and the UE that is sent byeach base station. In this embodiment, after the second base stationobtains the uplink path loss between each base station and the UE thatis sent by each base station, the second base station further needs tocalculate an uplink path loss between the second base station and theUE. Then, the initial maximum uplink transmit power allocating unit 512obtains by calculation, from the maximum uplink transmit power of the UEand according to a proportion of each uplink path loss, the initialmaximum uplink transmit power that is allocated by the UE to each basestation. Finally, the initial maximum uplink transmit power sendingmodule 53 sends each initial maximum uplink transmit power to acorresponding base station. Therefore, the base station provided by thisembodiment further includes a reference signal receiving module 54 andan uplink path loss determining module 55.

The reference signal receiving module 54 is configured to receive asounding reference signal sent by the UE. The uplink path lossdetermining module 55 is configured to determine the uplink path lossbetween the second base station and the UE according to a receive powerand a transmit power of the sounding reference signal, and provide thedetermined uplink path loss for the initial maximum uplink transmitpower acquiring module 51.

The initial maximum uplink transmit power acquiring module 51 is furtherconfigured to: add a supplementary offset to an initial maximum uplinktransmit power that is allocated to the secondary base station afterobtaining the initial maximum uplink transmit power that is allocated bythe UE to each base station. The initial maximum uplink transmit poweracquiring module acquires, according to a set period, or when the uplinkpath loss or downlink path loss changes, or when a path loss variationexceeds a set threshold, the initial maximum uplink transmit power thatis allocated by the UE to the second base station.

The second base station provided by this embodiment may be configured toexecute the technical solutions of method Embodiment 4 to Embodiment 6and Embodiment 9 to Embodiment 11. The specific implementation mannerand technical effect are similar, and are not further described herein.

FIG. 17 is a schematic structural diagram of Embodiment 6 of userequipment UE according to the present invention. As shown in FIG. 17,the UE provided by this embodiment includes an uplink resource statusacquiring module 61 and an uplink resource status reporting module 62.

The uplink resource status acquiring module 61 is configured to acquirea status of an uplink resource that is scheduled by a second basestation for the UE.

The uplink resource status acquiring module 61 is specificallyconfigured to: receive the status that is of the uplink resource and issent by using a MAC CE, an RRC message, or uplink control information bythe second base station; or receive an SPS configuration command, an SPSconfiguration deletion command, an SPS activation instruction, and anSPS deactivation instruction that are sent by the second base station,and use the commands and instructions as the status of the uplinkresource; or identify whether the second base station does not schedulethe uplink resource within a set time, and determine the status of theuplink resource according to an identification result.

The uplink resource status reporting module 62 is configured to reportthe status of the uplink resource that is scheduled by the second basestation for the UE, to a first base station, so that the first basestation determines, according to the status of the uplink resource, amaximum uplink transmit power that is allocated by the UE to the firstbase station; or determine, according to the status of the uplinkresource that is scheduled by the second base station for the UE, amaximum uplink transmit power that is allocated by the UE to the firstbase station, and report the maximum uplink transmit power to the firstbase station.

The UE provided by this embodiment acquires a status of an uplinkresource that is scheduled by a second base station for the UE, andreports the status of the uplink resource to a first base station, sothat the first base station determines, according to the status of theuplink resource that is scheduled by the second base station for the UE,a maximum uplink transmit power; or the UE determines, according to thestatus of the uplink resource that is scheduled by the second basestation for the UE, a maximum uplink transmit power allocated to thefirst base station, and reports the maximum uplink transmit power to thefirst base station. Therefore, it is ensured that the maximum uplinktransmit power allocated to the first base station is determinedaccording to a resource between base stations, a maximum uplink transmitpower can be allocated to each base station properly, and a throughputof the UE and utilization of a network are increased.

FIG. 18 is a schematic structural diagram of Embodiment 7 of userequipment UE according to the present invention. In this embodiment, afirst base station is a secondary base station, and a second basestation is a master base station. As shown in FIG. 18, the UE providedby this embodiment includes an uplink resource status acquiring module71 and an uplink resource status reporting module 72.

The uplink resource status acquiring module 71 is configured to acquirea status of an uplink resource that is scheduled by a second basestation for the UE.

The uplink resource status reporting module 72 is configured to reportthe status of the uplink resource that is scheduled by the second basestation for the UE, to a first base station, so that the first basestation determines, according to the status of the uplink resource, amaximum uplink transmit power that is allocated by the UE to the firstbase station; or determine, according to the status of the uplinkresource that is scheduled by the second base station for the UE, amaximum uplink transmit power that is allocated by the UE to the firstbase station, and report the maximum uplink transmit power to the firstbase station.

In this embodiment, the uplink resource status reporting module 72includes a power offset determining unit 721 and a transmit powerdetermining unit 722.

The power offset determining unit 721 is configured to determine anoffset of an uplink transmit power according to the status of the uplinkresource that is scheduled by the second base station for the UE, wherea value of the offset is preconfigured, or is delivered by the secondbase station by using network signaling. The transmit power determiningunit 722 is configured to add the offset to an initial maximum uplinktransmit power that is allocated by the UE to the first base station,and determine that a sum of the offset and the initial maximum uplinktransmit power is the maximum uplink transmit power allocated by the UEto the first base station.

In this embodiment, the UE further includes an uplink path lossreporting module and an initial maximum uplink transmit powerdetermining module.

The uplink path loss reporting module is configured to report a downlinkpath loss between the UE and a base station to the base station, so thatthe base station determines, according to the downlink path loss, aninitial maximum uplink transmit power that is allocated by the UE to thebase station. The initial maximum uplink transmit power determiningmodule is configured to determine, according to the downlink path lossbetween the UE and the base station, the initial maximum uplink transmitpower that is allocated by the UE to the base station, and report theinitial maximum uplink transmit power to the base station.

Specifically, the uplink path loss reporting module includes a downlinkpath loss measuring unit and a downlink path loss reporting unit. Thedownlink path loss measuring unit is configured to measure a downlinkpath loss between the UE and each base station. The downlink path lossreporting unit is configured to report the downlink path loss betweenthe UE and each base station to the second base station.

The initial maximum uplink transmit power determining module includes adownlink path loss measuring unit, an initial maximum uplink transmitpower allocating unit, and an initial maximum uplink transmit powerreporting unit.

The downlink path loss measuring unit is configured to measure adownlink path loss between the UE and each base station. The downlinkpath loss measuring unit is specifically configured to: receive asounding reference signal sent by each base station, and determine thedownlink path loss between the UE and each base station according to areceive power and a transmit power of the sounding reference signal.

The initial maximum uplink transmit power allocating unit is configuredto obtain by calculation, from a maximum uplink transmit power of theUE, an initial maximum uplink transmit power that is allocated to eachbase station. The initial maximum uplink transmit power allocating unitis further configured to add a supplementary offset to the maximumuplink transmit power that is allocated to the first base station.

The initial maximum uplink transmit power reporting unit is configuredto report the determined initial maximum uplink transmit power to eachbase station, or report the determined initial maximum uplink transmitpower to the second base station, so that the second base stationforwards the determined initial maximum uplink transmit power to eachbase station.

The initial maximum uplink transmit power determining module acquires,according to a set period, or when the uplink path loss or downlink pathloss changes, or when a path loss variation exceeds a set threshold, theinitial maximum uplink transmit power that is allocated by the UE toeach base station.

The UE provided by this embodiment may be configured to execute thetechnical solutions provided by method Embodiment 7 to Embodiment 9. Thespecific implementation manner and technical effect are similar, andtherefore are not further described herein.

FIG. 19 is a schematic structural diagram of Embodiment 8 of a firstbase station according to the present invention. As shown in FIG. 19, afirst base station 800 provided by this embodiment includes a processor81 and a memory 82. The first base station 800 may further include atransmitter 83 and a receiver 84. The memory 82, transmitter 83, andreceiver 84 are connected to the processor 81 by using a bus. The busmay be one or more physical lines. When the bus is more than onephysical line, the bus may be divided into an address bus, a data bus, acontrol bus, and the like. The memory 82 stores an executioninstruction; when the first base station 800 runs, the processor 81communicates with the memory 82; and the processor 81 invokes theexecution instruction in the memory 82 to execute the followingoperations:

The receiver 84 acquires a maximum uplink transmit power that isallocated by user equipment UE to the first base station, where themaximum uplink transmit power is determined according to a status of anuplink resource that is scheduled by a second base station for the UE.

The processor 81 configures an uplink transmit power for the UEaccording to the maximum uplink transmit power.

In a possible implementation manner of this embodiment, the first basestation is a secondary base station, and the second base station is amaster base station.

The receiver 84 is specifically configured to receive, from the secondbase station or the UE, the status of the uplink resource that isscheduled by the second base station for the UE; and then the processor81 determines, according to the status of the uplink resource that isscheduled by the second base station for the UE, the maximum uplinktransmit power that is allocated by the UE to the first base station.Specifically, the processor 81 determines an offset of an uplinktransmit power according to the status of the uplink resource that isscheduled by the second base station for the UE; and then adds theoffset to an initial maximum uplink transmit power that is allocated bythe UE to the first base station, and determines that a sum of theoffset and the initial maximum uplink transmit power is the maximumuplink transmit power allocated by the UE to the first base station. Theprocessor 81 determines the offset of the uplink transmit power whenidentifying, according to the status of the uplink resource that isscheduled by the second base station for the UE, that an uplink resourcescheduled by the second base station for the UE at a current time pointis lower than a set threshold, where a value of the offset ispreconfigured.

The receiver 84 is further configured to receive, from the second basestation or the UE, the maximum uplink transmit power that is allocatedby the UE to the first base station, where the maximum uplink transmitpower is determined by the second base station or the UE according tothe status of the uplink resource that is scheduled by the second basestation for the UE.

The status of the uplink resource is semi-persistent schedulingconfiguration information of the uplink resource that is scheduled forthe UE when the second base station establishes a voice service for theUE. The semi-persistent scheduling configuration information includes asemi-persistent scheduling SPS configuration command, an SPSconfiguration deletion command, an SPS activation instruction, and anSPS deactivation instruction.

The processor 81 is further configured to: after allocating the uplinktransmit power to the UE according to the maximum uplink transmit power,when the determined uplink transmit power changes compared with ahistorical value, or when a variation exceeds a preset threshold,acquire a power headroom of the UE that is recalculated according to themaximum uplink transmit power.

The receiver 84 is further configured to receive preset powerinformation sent by the second base station, where the preset powerinformation includes at least an uplink transmit power that ispreconfigured by the second base station at a next time point for theUE; and the processor 81 is configured to determine, according to thepreset power information, an uplink transmit power that is configured bythe first base station at the next time point for the UE. The presetpower information includes: a maximum transmit power of the UE, amaximum transmit power allocated by the UE to the second base station,an uplink control information scheduling status of the UE, a maximumtransmit power allocated by the UE to each carrier of the second basestation, and an offset of an uplink transmit power used by the secondbase station.

In this embodiment, the receiver 84 is further configured to acquire theinitial maximum uplink transmit power that is allocated by the UE to thefirst base station, where the initial maximum uplink transmit power isdetermined according to a downlink path loss or an uplink path lossbetween each base station and the UE. The processor 81 is configured toallocate the uplink transmit power to the UE according to the initialmaximum uplink transmit power.

The receiver 84 is specifically configured to receive the initialmaximum uplink transmit power that is allocated by the UE to the firstbase station and reported by the UE, where the initial maximum uplinktransmit power is allocated by the UE from the maximum uplink transmitpower of the UE according to a proportion of the downlink path lossbetween each base station and the UE. Alternatively, the receiver 84receives the initial maximum uplink transmit power that is allocated bythe UE to the first base station and sent by the second base station,where the initial maximum uplink transmit power is allocated by thesecond base station from the maximum uplink transmit power of the UEaccording to a proportion of the downlink path loss between each basestation and the UE.

In a feasible implementation manner, the receiver 84 receives thedownlink path loss of each base station that is reported by the UE; andthen, the processor 81 obtains by calculation, from the maximum uplinktransmit power of the UE and according to the proportion of eachdownlink path loss, the initial maximum uplink transmit power that isallocated by the UE to the first base station.

In another feasible implementation manner, the receiver 84 is configuredto acquire the uplink path loss between each base station and the UEthat is sent by the second base station; and the processor 81 obtains bycalculation, from the maximum uplink transmit power of the UE andaccording to a proportion of each uplink path loss, the initial maximumuplink transmit power that is allocated by the UE to the first basestation. Alternatively, the receiver 84 may also receive a soundingreference signal sent by the UE; then, the processor 81 determines anuplink path loss between the first base station and the UE according toa receive power and a transmit power of the sounding reference signal;and the transmitter 83 reports the uplink path loss between the firstbase station and the UE to the second base station, so that the secondbase station forwards the uplink path loss to other base stations.

The processor 81 is further configured to add a supplementary offset tothe initial maximum uplink transmit power after the initial maximumuplink transmit power that is allocated by the UE to the first basestation is acquired. In this embodiment, the receiver 84 acquires,according to a set period, or when the uplink path loss or downlink pathloss changes, or when a path loss variation exceeds a set threshold, theinitial maximum uplink transmit power that is allocated by the UE to thefirst base station.

FIG. 20 is a schematic structural diagram of Embodiment 9 of a secondbase station. As shown in FIG. 20, a second base station 900 provided bythis embodiment includes a processor 91 and a memory 92. The second basestation 900 may further include a transmitter 93 and a receiver 94. Thememory 92, transmitter 93, and receiver 94 are connected to theprocessor 91 by using a bus. The memory 92 stores an executioninstruction; when the second base station 900 runs, the processor 91communicates with the memory 92; and the processor 91 invokes theexecution instruction in the memory 92 to execute the followingoperations:

The transmitter 93 is configured to provide, for a first base station, astatus of an uplink resource that is scheduled by the second basestation for UE, so that the first base station determines, according tothe status of the uplink resource that is scheduled by the second basestation for the UE, a maximum uplink transmit power that is allocated bythe UE to the first base station.

The processor 91 is configured to schedule the uplink resource for theUE according to the status of the uplink resource.

In a possible implementation manner of this embodiment, the first basestation is a secondary base station, and the second base station is amaster base station.

The transmitter 93 is specifically configured to: send the status of theuplink resource that is scheduled by the second base station for the UE,to the first base station; or send the status of the uplink resourcethat is scheduled by the second base station for the UE, to the firstbase station through the UE. Specifically, the transmitter 93 may sendthe status of the uplink resource that is scheduled by the second basestation for the UE, to the UE by using a MAC CE, an RRC message, oruplink control information, so that the UE sends the status of theuplink resource to the first base station.

Optionally, when establishing a voice service for the UE, the processor91 may also configure semi-persistent scheduling of the uplink resourcefor the UE; and then the transmitter 93 sends semi-persistent schedulingconfiguration information to the first base station, or sendssemi-persistent scheduling configuration information to the UE, so thatthe UE sends the semi-persistent scheduling configuration information tothe first base station. The semi-persistent scheduling configurationinformation includes an SPS configuration command, an SPS configurationdeletion command, an SPS activation instruction, and an SPS deactivationinstruction.

The processor 91 is further configured to configure preset powerinformation for the second base station, where the preset powerinformation includes at least an uplink transmit power that ispreconfigured by the second base station at a next time point for theUE; and the transmitter 93 sends the preset power information to thefirst base station, so that the first base station determines, accordingto the preset power information, an uplink transmit power that isconfigured by the first base station at the next time point for the UE.The preset power information includes: a maximum transmit power of theUE, a maximum transmit power allocated by the UE to the second basestation, an uplink control information scheduling status of the UE, amaximum transmit power allocated by the UE to each carrier of the secondbase station, and an offset of an uplink transmit power used by thesecond base station.

The receiver 94 is configured to acquire an initial maximum uplinktransmit power that is allocated by the UE to the second base station,where the initial maximum uplink transmit power is determined accordingto a downlink path loss or an uplink path loss between each base stationand the UE; and the processor 91 allocates the uplink transmit power tothe UE according to the initial maximum uplink transmit power.

Specifically, the receiver 94 is configured to receive the initialmaximum uplink transmit power that is allocated by the UE to the secondbase station and reported by the UE, where the initial maximum uplinktransmit power is allocated by the UE from the maximum uplink transmitpower of the UE according to a proportion of the downlink path lossbetween each base station and the UE. Alternatively, the receiver 94receives an initial maximum uplink transmit power that is allocated bythe UE to each base station and reported by the UE. Certainly, thereceiver 94 may also receive the downlink path loss of each base stationthat is reported by the UE, and then the processor 91 obtains bycalculation, from the maximum uplink transmit power of the UE andaccording to the proportion of each downlink path loss, the initialmaximum uplink transmit power that is allocated by the UE to each basestation, and the transmitter 93 sends each initial maximum uplinktransmit power to a corresponding base station.

In a feasible implementation manner, the receiver 94 is configured toacquire the uplink path loss between each base station and the UE thatis sent by each base station. The processor 91 obtains by calculation,from the maximum uplink transmit power of the UE and according to aproportion of each uplink path loss, the initial maximum uplink transmitpower that is allocated by the UE to each base station. The transmitter93 sends each initial maximum uplink transmit power to a correspondingbase station.

The receiver 94 is further configured to receive a sounding referencesignal sent by the UE; and then the processor 91 determines an uplinkpath loss between the second base station and the UE according to areceive power and a transmit power of the sounding reference signal.

The processor 91 is further configured to add a supplementary offset toan initial maximum uplink transmit power that is allocated to thesecondary base station.

In this embodiment, the receiver 94 acquires, according to a set period,or when the uplink path loss or downlink path loss changes, or when apath loss variation exceeds a set threshold, the initial maximum uplinktransmit power that is allocated by the UE to the second base station.

FIG. 21 is a schematic structural diagram of Embodiment 10 of userequipment UE according to the present invention. As shown in FIG. 21, UE1000 provided by this embodiment includes a processor 110 and a memory120. The UE 1000 may further include a transmitter 130 and a receiver140. The memory 120, transmitter 130, and receiver 140 are connected tothe processor 110 by using a bus. The memory 120 stores an executioninstruction; when the UE 1000 runs, the processor 110 communicates withthe memory 120; and the processor 110 invokes the execution instructionin the memory 120 to execute the following operations:

The receiver 140 is configured to acquire a status of an uplink resourcethat is scheduled by a second base station for the UE.

The transmitter 130 reports the status of the uplink resource that isscheduled by the second base station for the UE, to a first basestation, so that the first base station determines, according to thestatus of the uplink resource, a maximum uplink transmit power that isallocated by the UE to the first base station; or the processor 110determines, according to the status of the uplink resource that isscheduled by the second base station for the UE, a maximum uplinktransmit power that is allocated by the UE to the first base station,and reports the maximum uplink transmit power to the first base stationthrough the transmitter 130.

In this embodiment, the first base station is a secondary base station,and the second base station is a master base station.

The processor 110 is specifically configured to determine an offset ofan uplink transmit power according to the status of the uplink resourcethat is scheduled by the second base station for the UE; and add theoffset to an initial maximum uplink transmit power that is allocated bythe UE to the first base station, and determine that a sum of the offsetand the initial maximum uplink transmit power is the maximum uplinktransmit power allocated by the UE to the first base station, where avalue of the offset is preconfigured or is delivered by the second basestation by using network signaling.

The receiver 140 is further configured to receive the status that is ofthe uplink resource and is sent by using a MAC CE, an RRC message, oruplink control information by the second base station, or receive an SPSconfiguration command, an SPS configuration deletion command, an SPSactivation instruction, and an SPS deactivation instruction that aresent by the second base station; the processor 110 uses the SPSconfiguration command, the SPS configuration deletion command, the SPSactivation instruction, and the SPS deactivation instruction as thestatus of the uplink resource. Alternatively, the processor 110identifies whether the second base station does not schedule the uplinkresource within a set time, and determines the status of the uplinkresource according to an identification result.

The transmitter 130 is further configured to report a downlink path lossbetween the UE and a base station to the base station, so that the basestation determines, according to the downlink path loss, an initialmaximum uplink transmit power that is allocated by the UE to the basestation.

The processor 110 determines, according to a downlink path loss betweeneach base station and a base station, an initial maximum uplink transmitpower that is allocated by the UE to the base station, and reports theinitial maximum uplink transmit power to the base station through thetransmitter 130. The processor 110 is further configured to measure adownlink path loss between the UE and each base station, and report thedownlink path loss between the UE and each base station to the secondbase station through the transmitter 130.

Specifically, the processor 110 is further configured to measure adownlink path loss between the UE and each base station; then obtain bycalculation, from a maximum uplink transmit power of the UE andaccording to a proportion of the downlink path loss between the UE andeach base station, an initial maximum uplink transmit power allocated toeach base station; and report the determined initial maximum uplinktransmit power to each base station through the transmitter 130, orreport the determined initial maximum uplink transmit power to thesecond base station, so that the second base station forwards thedetermined initial maximum uplink transmit power to each base station.

Specifically, the downlink path loss between the UE and each basestation is measured in the following manner: First, the receiver 140receives a sounding reference signal sent by each base station; and thenthe processor 110 determines the downlink path loss between the UE andeach base station according to a receive power and a transmit power ofthe sounding reference signal.

In this embodiment, after the processor 110 obtains by calculation, fromthe maximum uplink transmit power of the UE and according to theproportion of the downlink path loss between the UE and each basestation, the initial maximum uplink transmit power allocated to eachbase station, the processor 110 is further configured to add asupplementary offset to the maximum uplink transmit power that isallocated to the first base station.

The receiver 140 acquires, according to a set period, or when the uplinkpath loss or downlink path loss changes, or when a path loss variationexceeds a set threshold, the initial maximum uplink transmit power thatis allocated by the UE to each base station.

Persons of ordinary skill in the art may understand that all or some ofthe steps of the method embodiments may be implemented by a programinstructing related hardware. The program may be stored in acomputer-readable storage medium. When the program runs, the steps ofthe method embodiments are performed. The foregoing storage mediumincludes: any medium that can store program code, such as a ROM, a RAM,a magnetic disc, or an optical disc.

Finally, it should be noted that the foregoing embodiments are merelyintended for describing the technical solutions of the presentinvention, but not for limiting the present invention. Although thepresent invention is described in detail with reference to the foregoingembodiments, persons of ordinary skill in the art should understand thatthey may still make modifications to the technical solutions describedin the foregoing embodiments or make equivalent replacements to some orall technical features of the technical solutions, without departingfrom the scope of the technical solutions of the embodiments of thepresent invention.

What is claimed is:
 1. A method comprising: providing for a first basestation, by a second base station, a status of an uplink resource thatis scheduled by the second base station for a user equipment (UE),wherein a maximum uplink transmit power that is allocated by the UE tothe first base station is based on the status of the uplink resource;and scheduling for the UE, by the second base station, the uplinkresource according to the status of the uplink resource.
 2. The methodaccording to claim 1, wherein the first base station is a secondary basestation and the second base station is a master base station.
 3. Themethod according to claim 1, wherein providing for the first basestation, by the second base station, the status of the uplink resourcethat is scheduled by the second base station for the UE comprises:sending, by the second base station, the status of the uplink resourceto the first base station; or sending, by the second base station, thestatus of the uplink resource to the first base station through the UE.4. The method according to claim 1, further comprising: configuring, bythe second base station, preset power information, wherein the presetpower information comprises an uplink transmit power that ispreconfigured by the second base station at a next time point for theUE; and sending, by the second base station, the preset powerinformation to the first base station, wherein an uplink transmit powerthat is configured by the first base station at the next time point forthe UE is based on the preset power information.
 5. The method accordingto claim 1, further comprising: acquiring, by the second base station,an initial maximum uplink transmit power that is allocated by the UE tothe second base station, wherein the initial maximum uplink transmitpower is based on a downlink path loss or an uplink path loss betweeneach base station and the UE; and allocating, by the second basestation, an uplink transmit power to the UE based on the initial maximumuplink transmit power.
 6. A method comprising: acquiring, by a userequipment (UE), a status of an uplink resource that is scheduled by asecond base station for the UE; and reporting to a first base station,by the UE, the status of the uplink resource, wherein a maximum uplinktransmit power that is allocated by the UE to the first base station isbased on the status of the uplink resource; or determining, by the UE,according to the status of the uplink resource, a maximum uplinktransmit power that is allocated by the UE to the first base station,and reporting, by the UE to the first base station, the maximum uplinktransmit power.
 7. The method according to claim 6, wherein the firstbase station is a secondary base station and the second base station isa master base station.
 8. The method according to claim 6, whereindetermining, by the UE, according to the status of the uplink resource,the maximum uplink transmit power that is allocated by the UE to thefirst base station comprises: determining, by the UE, an offset of anuplink transmit power according to the status of the uplink resourcethat is scheduled by the second base station for the UE; and adding, bythe UE, the offset to an initial maximum uplink transmit power that isallocated by the UE to the first base station, and determining, by theUE, that a sum of the offset and the initial maximum uplink transmitpower is the maximum uplink transmit power allocated by the UE to thefirst base station.
 9. The method according to claim 6, wherein theacquiring, by the UE, the status of an uplink resource that is scheduledby a second base station for the UE comprises receiving, by the UE, thestatus of the uplink resource, the status of the uplink resource beingsent by the second base station using a media access control element(MAC) control element (CE), a radio resource control (RRC) message, oruplink control information; or receiving, by the UE, a semi-persistentscheduling (SPS) configuration command, an SPS configuration deletioncommand, an SPS activation instruction, and an SPS deactivationinstruction that are sent by the second base station, and using thecommands and instructions as the status of the uplink resource; oridentifying, by the UE, whether the second base station does notschedule the uplink resource within a set time, and determining thestatus of the uplink resource according to an identification result. 10.The method according to claim 6, wherein a selected base stationcomprises the first base station or the second base station, and whereinthe method further comprises: reporting, by the UE to the selected basestation, a downlink path loss between the UE and the selected basestation; or determining, by the UE, according to a downlink path lossbetween the UE and the selected base station, an initial maximum uplinktransmit power that is allocated by the UE to the selected base station,and reporting, by the UE to the selected base station, the initialmaximum uplink transmit power.
 11. A second base station comprising: aprocessor; and a computer-readable storage medium storing a program tobe executed by the processor, the program including instructions for:providing for a first base station, a status of an uplink resource thatis scheduled by the second base station for user equipment (UE), whereina maximum uplink transmit power that is allocated by the UE to the firstbase station is based on the status of the uplink resource; andscheduling for the UE, the uplink resource according to the status ofthe uplink resource.
 12. The second base station according to claim 11,wherein the first base station is a secondary base station and thesecond base station is a master base station.
 13. The second basestation according to claim 11, wherein providing for the first basestation, the status of the uplink resource that is scheduled by thesecond base station for the UE comprises: utilizing a transmitter tosend the status of the uplink resource to the first base station; orutilizing a transmitter to send the status of the uplink resource to thefirst base station through the UE.
 14. The second base station accordingto claim 11, wherein the program further includes instructions for:configuring preset power information, wherein the preset powerinformation comprises an uplink transmit power that is preconfigured bythe second base station at a next time point for the UE; and utilizing atransmitter to send the preset power information to the first basestation, wherein an uplink transmit power that is configured by thefirst base station at the next time point for the UE is based on thepreset power information.
 15. The second base station according to claim11, wherein the program further includes instructions for: acquiring aninitial maximum uplink transmit power that is allocated by the UE to thesecond base station, wherein the initial maximum uplink transmit poweris based on a downlink path loss or an uplink path loss between eachbase station and the UE; and allocating an uplink transmit power to theUE based on the initial maximum uplink transmit power.
 16. A devicecomprising: a processor coupled with a memory, wherein the memory storesa program to be executed by the processor, the program includinginstructions for: acquiring a status of an uplink resource that isscheduled by a second base station for the device; and reporting to afirst base station the status of the uplink resource, wherein a maximumuplink transmit power that is allocated by the device to the first basestation is based on the status of the uplink resource; or determining,according to the status of the uplink resource, a maximum uplinktransmit power that is allocated by the device to the first basestation, and reporting to the first base station, the maximum uplinktransmit power.
 17. The device according to claim 16, wherein the firstbase station is a secondary base station and the second base station isa master base station.
 18. The device according to claim 16, whereindetermining, according to the status of the uplink resource, the maximumuplink transmit power that is allocated by the device to the first basestation, comprises: determining an offset of an uplink transmit poweraccording to the status of the uplink resource that is scheduled by thesecond base station for the device; and adding the offset to an initialmaximum uplink transmit power that is allocated by the device to thefirst base station, and determining that a sum of the offset and theinitial maximum uplink transmit power is the maximum uplink transmitpower allocated by the device to the first base station.
 19. The deviceaccording to claim 16, wherein acquiring the status of the uplinkresource that is scheduled by the second base station for the devicecomprises: utilize a receiver to receive the status of the uplinkresource, the status of the uplink resource being sent by the secondbase station using a media access control element (MAC) control element(CE), a radio resource control (RRC) message, or uplink controlinformation; or utilize a receiver to receive a semi-persistentscheduling (SPS) configuration command, an SPS configuration deletioncommand, an SPS activation instruction, and an SPS deactivationinstruction that are sent by the second base station, and using thecommands and instructions as the status of the uplink resource; oridentifying whether the second base station does not schedule the uplinkresource within a set time, and determining the status of the uplinkresource according to an identification result.
 20. The device accordingto claim 16, wherein a selected base station comprises the first basestation or the second base station, and the program further includesinstructions for: reporting to the selected base station, a downlinkpath loss between the device and the selected base station; ordetermining, according to a downlink path loss between the device andthe selected base station, an initial maximum uplink transmit power thatis allocated by the device to the selected base station, and reportingto the selected base station, the initial maximum uplink transmit power.